131721529 has 9 divisors (see below), whose sum is σ = 137974053. Its totient is φ = 125742012.

The previous prime is 131721521. The next prime is 131721539. The reversal of 131721529 is 925127131.

The square root of 131721529 is 11477.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 131721529 - 2³ = 131721521 is a prime.

It is a super-2 number, since 2×131721529² = 34701122404195682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131721529.

It is not an unprimeable number, because it can be changed into a prime (131721521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 263722 + ... + 264220.

Almost surely, 2^131721529 is an apocalyptic number.

131721529 is the 11477-th square number.

131721529 is the 5739-th centered octagonal number.

It is an amenable number.

131721529 is a deficient number, since it is larger than the sum of its proper divisors (6252524).

131721529 is an frugal number, since it uses more digits than its factorization.

131721529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044 (or 522 counting only the distinct ones).

The product of its digits is 3780, while the sum is 31.

The cubic root of 131721529 is about 508.8060356391.

The spelling of 131721529 in words is "one hundred thirty-one million, seven hundred twenty-one thousand, five hundred twenty-nine".