161292724 has 6 divisors (see below), whose sum is σ = 282262274. Its totient is φ = 80646360.

The previous prime is 161292709. The next prime is 161292773. The reversal of 161292724 is 427292161.

It can be written as a sum of positive squares in only one way, i.e., 88736400 + 72556324 = 9420^2 + 8518^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161292724.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20161587 + ... + 20161594.

Almost surely, 2^161292724 is an apocalyptic number.

It is an amenable number.

161292724 is a deficient number, since it is larger than the sum of its proper divisors (120969550).

161292724 is a wasteful number, since it uses less digits than its factorization.

161292724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40323185 (or 40323183 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 161292724 is about 12700.1072436417. The cubic root of 161292724 is about 544.3416835936.

The spelling of 161292724 in words is "one hundred sixty-one million, two hundred ninety-two thousand, seven hundred twenty-four".