161844831 has 32 divisors (see below), whose sum is σ = 260556800. Its totient is φ = 98910720.

The previous prime is 161844817. The next prime is 161844833. The reversal of 161844831 is 138448161.

It is a happy number.

161844831 is a `hidden beast` number, since 1 + 618 + 4 + 4 + 8 + 31 = 666.

It is not a de Polignac number, because 161844831 - 2⁵ = 161844799 is a prime.

It is a super-2 number, since 2×161844831² = 52387498642837122, 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 (161844833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10815 + ... + 20991.

It is an arithmetic number, because the mean of its divisors is an integer number (8142400).

Almost surely, 2^161844831 is an apocalyptic number.

161844831 is a deficient number, since it is larger than the sum of its proper divisors (98711969).

161844831 is a wasteful number, since it uses less digits than its factorization.

161844831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236 (or 10230 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 161844831 is about 12721.8249870056. The cubic root of 161844831 is about 544.9620723823.

The spelling of 161844831 in words is "one hundred sixty-one million, eight hundred forty-four thousand, eight hundred thirty-one".