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816870708481 = 532170532
BaseRepresentation
bin10111110001100010100…
…10011101010100000001
32220002111010100112021111
423320301102131110001
5101340422400132411
61423133142123321
7113005550313022
oct13706122352401
92802433315244
10816870708481
11295484245783
12112394420541
135c052241909
142b772bcac49
15163ae47a721
hexbe3149d501

816870708481 has 9 divisors (see below), whose sum is σ = 832622993769. Its totient is φ = 801411055536.

The previous prime is 816870708443. The next prime is 816870708491. The reversal of 816870708481 is 184807078618.

The square root of 816870708481 is 903809.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 7158682881 + 809712025600 = 84609^2 + 899840^2 .

It is not a de Polignac number, because 816870708481 - 221 = 816868611329 is a prime.

It is a super-2 number, since 2×8168707084812 (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816870708421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 47893351 + ... + 47910403.

Almost surely, 2816870708481 is an apocalyptic number.

816870708481 is the 903809-th square number.

816870708481 is the 451905-th centered octagonal number.

It is an amenable number.

816870708481 is a deficient number, since it is larger than the sum of its proper divisors (15752285288).

816870708481 is an frugal number, since it uses more digits than its factorization.

816870708481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34212 (or 17106 counting only the distinct ones).

The product of its (nonzero) digits is 4816896, while the sum is 58.

The spelling of 816870708481 in words is "eight hundred sixteen billion, eight hundred seventy million, seven hundred eight thousand, four hundred eighty-one".

Divisors: 1 53 2809 17053 903809 47901877 290804809 15412654877 816870708481