131721572 has 6 divisors (see below), whose sum is σ = 230512758. Its totient is φ = 65860784.

The previous prime is 131721563. The next prime is 131721613. The reversal of 131721572 is 275127131.

It can be written as a sum of positive squares in only one way, i.e., 131239936 + 481636 = 11456^2 + 694^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16465193 + ... + 16465200.

It is an arithmetic number, because the mean of its divisors is an integer number (38418793).

Almost surely, 2^131721572 is an apocalyptic number.

It is an amenable number.

131721572 is a deficient number, since it is larger than the sum of its proper divisors (98791186).

131721572 is a wasteful number, since it uses less digits than its factorization.

131721572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32930397 (or 32930395 counting only the distinct ones).

The product of its digits is 2940, while the sum is 29.

The square root of 131721572 is about 11477.0018733117. The cubic root of 131721572 is about 508.8060910050.

The spelling of 131721572 in words is "one hundred thirty-one million, seven hundred twenty-one thousand, five hundred seventy-two".