161511275 has 12 divisors (see below), whose sum is σ = 200435832. Its totient is φ = 129104640.

The previous prime is 161511263. The next prime is 161511283. The reversal of 161511275 is 572115161.

It is a de Polignac number, because none of the positive numbers 2^k-161511275 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48824 + ... + 52026.

It is an arithmetic number, because the mean of its divisors is an integer number (16702986).

Almost surely, 2^161511275 is an apocalyptic number.

161511275 is a deficient number, since it is larger than the sum of its proper divisors (38924557).

161511275 is a wasteful number, since it uses less digits than its factorization.

161511275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230 (or 5225 counting only the distinct ones).

The product of its digits is 2100, while the sum is 29.

The square root of 161511275 is about 12708.7086283383. The cubic root of 161511275 is about 544.5874329032.

The spelling of 161511275 in words is "one hundred sixty-one million, five hundred eleven thousand, two hundred seventy-five".