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2161255461 = 31609447743
BaseRepresentation
bin1000000011010010…
…0010010000100101
312120121210011010120
42000310202100211
513411240133321
6554243112153
7104362240221
oct20064422045
95517704116
102161255461
11a09a77242
12503972659
132859b73b1
14167073781
15c9b16ec6
hex80d22425

2161255461 has 8 divisors (see below), whose sum is σ = 2883471360. Its totient is φ = 1439938272.

The previous prime is 2161255451. The next prime is 2161255471. The reversal of 2161255461 is 1645521612.

It is an interprime number because it is at equal distance from previous prime (2161255451) and next prime (2161255471).

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

It is not a de Polignac number, because 2161255461 - 25 = 2161255429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161255451) 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, 219045 + ... + 228698.

It is an arithmetic number, because the mean of its divisors is an integer number (360433920).

Almost surely, 22161255461 is an apocalyptic number.

It is an amenable number.

2161255461 is a deficient number, since it is larger than the sum of its proper divisors (722215899).

2161255461 is a wasteful number, since it uses less digits than its factorization.

2161255461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449355.

The product of its digits is 14400, while the sum is 33.

The square root of 2161255461 is about 46489.3048022876. The cubic root of 2161255461 is about 1292.9112107653.

The spelling of 2161255461 in words is "two billion, one hundred sixty-one million, two hundred fifty-five thousand, four hundred sixty-one".

Divisors: 1 3 1609 4827 447743 1343229 720418487 2161255461