131524021 has 4 divisors (see below), whose sum is σ = 133376544. Its totient is φ = 129671500.

The previous prime is 131524007. The next prime is 131524031. The reversal of 131524021 is 120425131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131524021 - 2⁵ = 131523989 is a prime.

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 131524021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131524031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 926155 + ... + 926296.

It is an arithmetic number, because the mean of its divisors is an integer number (33344136).

Almost surely, 2^131524021 is an apocalyptic number.

It is an amenable number.

131524021 is a deficient number, since it is larger than the sum of its proper divisors (1852523).

131524021 is an equidigital number, since it uses as much as digits as its factorization.

131524021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852522.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 131524021 is about 11468.3922587257. The cubic root of 131524021 is about 508.5516010682.

Adding to 131524021 its reverse (120425131), we get a palindrome (251949152).

The spelling of 131524021 in words is "one hundred thirty-one million, five hundred twenty-four thousand, twenty-one".