131011521 has 4 divisors (see below), whose sum is σ = 174682032. Its totient is φ = 87341012.

The previous prime is 131011499. The next prime is 131011541. The reversal of 131011521 is 125110131.

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 131011521 - 2⁶ = 131011457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131011521.

It is not an unprimeable number, because it can be changed into a prime (131011541) 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, 21835251 + ... + 21835256.

It is an arithmetic number, because the mean of its divisors is an integer number (43670508).

Almost surely, 2^131011521 is an apocalyptic number.

It is an amenable number.

131011521 is a deficient number, since it is larger than the sum of its proper divisors (43670511).

131011521 is an equidigital number, since it uses as much as digits as its factorization.

131011521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43670510.

The product of its (nonzero) digits is 30, while the sum is 15.

The square root of 131011521 is about 11446.0264284161. The cubic root of 131011521 is about 507.8901960064.

Adding to 131011521 its reverse (125110131), we get a palindrome (256121652).

The spelling of 131011521 in words is "one hundred thirty-one million, eleven thousand, five hundred twenty-one".