161507332 has 18 divisors (see below), whose sum is σ = 328783182. Its totient is φ = 69217344.

The previous prime is 161507329. The next prime is 161507389. The reversal of 161507332 is 233705161.

It can be written as a sum of positive squares in only one way, i.e., 118026496 + 43480836 = 10864^2 + 6594^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 161507332.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 411813 + ... + 412204.

Almost surely, 2^161507332 is an apocalyptic number.

It is an amenable number.

161507332 is an abundant number, since it is smaller than the sum of its proper divisors (167275850).

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

161507332 is a wasteful number, since it uses less digits than its factorization.

161507332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824035 (or 824026 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 161507332 is about 12708.5534975464. The cubic root of 161507332 is about 544.5830011678.

The spelling of 161507332 in words is "one hundred sixty-one million, five hundred seven thousand, three hundred thirty-two".