161312164 has 24 divisors (see below), whose sum is σ = 307155128. Its totient is φ = 73681920.

The previous prime is 161312149. The next prime is 161312171. The reversal of 161312164 is 461213161.

It can be written as a sum of positive squares in 4 ways, for example, as 1542564 + 159769600 = 1242^2 + 12640^2 .

It is a super-2 number, since 2×161312164² = 52043228508725792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10947 + ... + 21034.

Almost surely, 2^161312164 is an apocalyptic number.

It is an amenable number.

161312164 is a deficient number, since it is larger than the sum of its proper divisors (145842964).

161312164 is a wasteful number, since it uses less digits than its factorization.

161312164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32095 (or 32093 counting only the distinct ones).

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

The square root of 161312164 is about 12700.8725684498. The cubic root of 161312164 is about 544.3635518610.

The spelling of 161312164 in words is "one hundred sixty-one million, three hundred twelve thousand, one hundred sixty-four".