161564031 has 8 divisors (see below), whose sum is σ = 239354160. Its totient is φ = 107709336.

The previous prime is 161564021. The next prime is 161564047. The reversal of 161564031 is 130465161.

161564031 is a `hidden beast` number, since 1 + 6 + 15 + 640 + 3 + 1 = 666.

It is not a de Polignac number, because 161564031 - 2⁵ = 161563999 is a prime.

It is a super-2 number, since 2×161564031² = 52205872225937922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5983853 = 161564031 / (1 + 6 + 1 + 5 + 6 + 4 + 0 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 161563986 and 161564004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161564021) 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, 2991900 + ... + 2991953.

It is an arithmetic number, because the mean of its divisors is an integer number (29919270).

Almost surely, 2^161564031 is an apocalyptic number.

161564031 is a deficient number, since it is larger than the sum of its proper divisors (77790129).

161564031 is an equidigital number, since it uses as much as digits as its factorization.

161564031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5983862 (or 5983856 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 161564031 is about 12710.7840434806. The cubic root of 161564031 is about 544.6467210799.

The spelling of 161564031 in words is "one hundred sixty-one million, five hundred sixty-four thousand, thirty-one".