161632791 has 24 divisors (see below), whose sum is σ = 253693440. Its totient is φ = 98787600.

The previous prime is 161632777. The next prime is 161632813. The reversal of 161632791 is 197236161.

161632791 is a `hidden beast` number, since 1 + 616 + 32 + 7 + 9 + 1 = 666.

It is not a de Polignac number, because 161632791 - 2⁵ = 161632759 is a prime.

It is a super-2 number, since 2×161632791² = 52250318252899362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161632711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9945 + ... + 20546.

It is an arithmetic number, because the mean of its divisors is an integer number (10570560).

Almost surely, 2^161632791 is an apocalyptic number.

161632791 is a deficient number, since it is larger than the sum of its proper divisors (92060649).

161632791 is a wasteful number, since it uses less digits than its factorization.

161632791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30547 (or 30544 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 161632791 is about 12713.4885456353. The cubic root of 161632791 is about 544.7239754803.

The spelling of 161632791 in words is "one hundred sixty-one million, six hundred thirty-two thousand, seven hundred ninety-one".