161432631 has 12 divisors (see below), whose sum is σ = 233585352. Its totient is φ = 107434896.

The previous prime is 161432617. The next prime is 161432651. The reversal of 161432631 is 136234161.

161432631 is a `hidden beast` number, since 16 + 14 + 3 + 2 + 631 = 666.

It is not a de Polignac number, because 161432631 - 2⁷ = 161432503 is a prime.

It is a super-2 number, since 2×161432631² = 52120988703164322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161432595 and 161432604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161432611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9996 + ... + 20561.

It is an arithmetic number, because the mean of its divisors is an integer number (19465446).

Almost surely, 2^161432631 is an apocalyptic number.

161432631 is a deficient number, since it is larger than the sum of its proper divisors (72152721).

161432631 is a wasteful number, since it uses less digits than its factorization.

161432631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31150 (or 31147 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 161432631 is about 12705.6141528066. The cubic root of 161432631 is about 544.4990273365.

Adding to 161432631 its reverse (136234161), we get a palindrome (297666792).

The spelling of 161432631 in words is "one hundred sixty-one million, four hundred thirty-two thousand, six hundred thirty-one".