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891997261 = 53107157291
BaseRepresentation
bin110101001010101…
…100110001001101
32022011110011012121
4311022230301031
53311322403021
6224302332541
731050565051
oct6512546115
92264404177
10891997261
11418566821
1220a88a151
13112a53c3c
1486675c61
155349a741
hex352acc4d

891997261 has 8 divisors (see below), whose sum is σ = 917326944. Its totient is φ = 866982480.

The previous prime is 891997243. The next prime is 891997277. The reversal of 891997261 is 162799198.

891997261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 891997261 - 213 = 891989069 is a prime.

It is a super-2 number, since 2×8919972612 = 1591318227263004242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 891997199 and 891997208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891997231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72975 + ... + 84316.

It is an arithmetic number, because the mean of its divisors is an integer number (114665868).

Almost surely, 2891997261 is an apocalyptic number.

It is an amenable number.

891997261 is a deficient number, since it is larger than the sum of its proper divisors (25329683).

891997261 is a wasteful number, since it uses less digits than its factorization.

891997261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157451.

The product of its digits is 489888, while the sum is 52.

The square root of 891997261 is about 29866.3231918494. The cubic root of 891997261 is about 962.6191717512.

The spelling of 891997261 in words is "eight hundred ninety-one million, nine hundred ninety-seven thousand, two hundred sixty-one".

Divisors: 1 53 107 5671 157291 8336423 16830137 891997261