131539501 has 2 divisors, whose sum is σ = 131539502. Its totient is φ = 131539500.

The previous prime is 131539493. The next prime is 131539517. The reversal of 131539501 is 105935131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89302500 + 42237001 = 9450^2 + 6499^2 .

It is a cyclic number.

It is not a de Polignac number, because 131539501 - 2³ = 131539493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131539501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131539301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65769750 + 65769751.

It is an arithmetic number, because the mean of its divisors is an integer number (65769751).

Almost surely, 2^131539501 is an apocalyptic number.

It is an amenable number.

131539501 is a deficient number, since it is larger than the sum of its proper divisors (1).

131539501 is an equidigital number, since it uses as much as digits as its factorization.

131539501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2025, while the sum is 28.

The square root of 131539501 is about 11469.0671373046. The cubic root of 131539501 is about 508.5715519738.

The spelling of 131539501 in words is "one hundred thirty-one million, five hundred thirty-nine thousand, five hundred one".