870162561 has 16 divisors (see below), whose sum is σ = 1364961600. Its totient is φ = 545984064.

The previous prime is 870162547. The next prime is 870162563. The reversal of 870162561 is 165261078.

870162561 is a `hidden beast` number, since 87 + 0 + 16 + 2 + 561 = 666.

It is not a de Polignac number, because 870162561 - 2¹⁸ = 869900417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (870162563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947431 + ... + 948348.

It is an arithmetic number, because the mean of its divisors is an integer number (85310100).

Almost surely, 2^870162561 is an apocalyptic number.

It is an amenable number.

870162561 is a deficient number, since it is larger than the sum of its proper divisors (494799039).

870162561 is a wasteful number, since it uses less digits than its factorization.

870162561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895805 (or 1895799 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 870162561 is about 29498.5179458223. The cubic root of 870162561 is about 954.6997259599.

The spelling of 870162561 in words is "eight hundred seventy million, one hundred sixty-two thousand, five hundred sixty-one".