131335021 has 2 divisors, whose sum is σ = 131335022. Its totient is φ = 131335020.

The previous prime is 131334977. The next prime is 131335027. The reversal of 131335021 is 120533131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85285225 + 46049796 = 9235^2 + 6786^2 .

It is a cyclic number.

It is not a de Polignac number, because 131335021 - 2⁹ = 131334509 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131335021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131335027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65667510 + 65667511.

It is an arithmetic number, because the mean of its divisors is an integer number (65667511).

Almost surely, 2^131335021 is an apocalyptic number.

It is an amenable number.

131335021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131335021 is an equidigital number, since it uses as much as digits as its factorization.

131335021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 131335021 is about 11460.1492573177. The cubic root of 131335021 is about 508.3078880990.

Adding to 131335021 its reverse (120533131), we get a palindrome (251868152).

The spelling of 131335021 in words is "one hundred thirty-one million, three hundred thirty-five thousand, twenty-one".