161551592 has 8 divisors (see below), whose sum is σ = 302909250. Its totient is φ = 80775792.

The previous prime is 161551591. The next prime is 161551597. The reversal of 161551592 is 295155161.

It can be written as a sum of positive squares in only one way, i.e., 92428996 + 69122596 = 9614^2 + 8314^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (161551591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096967 + ... + 10096982.

Almost surely, 2^161551592 is an apocalyptic number.

It is an amenable number.

161551592 is a deficient number, since it is larger than the sum of its proper divisors (141357658).

161551592 is a wasteful number, since it uses less digits than its factorization.

161551592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20193955 (or 20193951 counting only the distinct ones).

The product of its digits is 13500, while the sum is 35.

The square root of 161551592 is about 12710.2947251431. The cubic root of 161551592 is about 544.6327430627.

It can be divided in two parts, 16155159 and 2, that added together give a palindrome (16155161).

The spelling of 161551592 in words is "one hundred sixty-one million, five hundred fifty-one thousand, five hundred ninety-two".