161237504 has 20 divisors (see below), whose sum is σ = 322161114. Its totient is φ = 80618496.

The previous prime is 161237471. The next prime is 161237513. The reversal of 161237504 is 405732161.

It can be written as a sum of positive squares in only one way, i.e., 84640000 + 76597504 = 9200^2 + 8752^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156947 + ... + 157970.

Almost surely, 2^161237504 is an apocalyptic number.

It is an amenable number.

161237504 is a deficient number, since it is larger than the sum of its proper divisors (160923610).

161237504 is an frugal number, since it uses more digits than its factorization.

161237504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314935 (or 314919 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 161237504 is about 12697.9330601480. The cubic root of 161237504 is about 544.2795564293.

Adding to 161237504 its reverse (405732161), we get a palindrome (566969665).

The spelling of 161237504 in words is "one hundred sixty-one million, two hundred thirty-seven thousand, five hundred four".