161531268 has 12 divisors (see below), whose sum is σ = 376906320. Its totient is φ = 53843752.

The previous prime is 161531213. The next prime is 161531273. The reversal of 161531268 is 862135161.

It is a tau number, because it is divible by the number of its divisors (12).

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, 6730458 + ... + 6730481.

It is an arithmetic number, because the mean of its divisors is an integer number (31408860).

Almost surely, 2^161531268 is an apocalyptic number.

It is an amenable number.

161531268 is an abundant number, since it is smaller than the sum of its proper divisors (215375052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161531268 is a wasteful number, since it uses less digits than its factorization.

161531268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13460946 (or 13460944 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 161531268 is about 12709.4951906045. The cubic root of 161531268 is about 544.6099029285.

The spelling of 161531268 in words is "one hundred sixty-one million, five hundred thirty-one thousand, two hundred sixty-eight".