161631412 has 12 divisors (see below), whose sum is σ = 283957380. Its totient is φ = 80500736.

The previous prime is 161631409. The next prime is 161631433. The reversal of 161631412 is 214136161.

It can be written as a sum of positive squares in 2 ways, for example, as 97535376 + 64096036 = 9876^2 + 8006^2 .

It is a super-2 number, since 2×161631412² = 52249426690227488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77587 + ... + 79642.

It is an arithmetic number, because the mean of its divisors is an integer number (23663115).

Almost surely, 2^161631412 is an apocalyptic number.

It is an amenable number.

161631412 is a deficient number, since it is larger than the sum of its proper divisors (122325968).

161631412 is a wasteful number, since it uses less digits than its factorization.

161631412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157490 (or 157488 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 161631412 is about 12713.4343117822. The cubic root of 161631412 is about 544.7224263382.

Adding to 161631412 its reverse (214136161), we get a palindrome (375767573).

The spelling of 161631412 in words is "one hundred sixty-one million, six hundred thirty-one thousand, four hundred twelve".