161562031 has 4 divisors (see below), whose sum is σ = 163607200. Its totient is φ = 159516864.

The previous prime is 161562013. The next prime is 161562047. The reversal of 161562031 is 130265161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130265161 = 13 ⋅10020397.

It is a cyclic number.

It is not a de Polignac number, because 161562031 - 2²⁵ = 128007599 is a prime.

It is a super-2 number, since 2×161562031² = 52204579721689922, 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 = 161561987 and 161562005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161562061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022466 + ... + 1022623.

It is an arithmetic number, because the mean of its divisors is an integer number (40901800).

Almost surely, 2^161562031 is an apocalyptic number.

161562031 is a deficient number, since it is larger than the sum of its proper divisors (2045169).

161562031 is an equidigital number, since it uses as much as digits as its factorization.

161562031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045168.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 161562031 is about 12710.7053698841. The cubic root of 161562031 is about 544.6444736780.

The spelling of 161562031 in words is "one hundred sixty-one million, five hundred sixty-two thousand, thirty-one".