161563031 has 8 divisors (see below), whose sum is σ = 191010720. Its totient is φ = 133707168.

The previous prime is 161563021. The next prime is 161563033. The reversal of 161563031 is 130365161.

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

It is not a de Polignac number, because 161563031 - 2¹⁴ = 161546647 is a prime.

It is a super-2 number, since 2×161563031² = 52205225971813922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161563033) 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, 397736 + ... + 398141.

It is an arithmetic number, because the mean of its divisors is an integer number (23876340).

Almost surely, 2^161563031 is an apocalyptic number.

161563031 is a deficient number, since it is larger than the sum of its proper divisors (29447689).

161563031 is an equidigital number, since it uses as much as digits as its factorization.

161563031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795913.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 161563031 is about 12710.7447067432. The cubic root of 161563031 is about 544.6455973813.

It can be divided in two parts, 1615 and 63031, that added together give a palindrome (64646).

The spelling of 161563031 in words is "one hundred sixty-one million, five hundred sixty-three thousand, thirty-one".