131323921 has 2 divisors, whose sum is σ = 131323922. Its totient is φ = 131323920.

The previous prime is 131323897. The next prime is 131323939. The reversal of 131323921 is 129323131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120670225 + 10653696 = 10985^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 131323921 - 2⁵ = 131323889 is a prime.

It is not a weakly prime, because it can be changed into another prime (131323961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65661960 + 65661961.

It is an arithmetic number, because the mean of its divisors is an integer number (65661961).

Almost surely, 2^131323921 is an apocalyptic number.

It is an amenable number.

131323921 is a deficient number, since it is larger than the sum of its proper divisors (1).

131323921 is an equidigital number, since it uses as much as digits as its factorization.

131323921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 131323921 is about 11459.6649601984. The cubic root of 131323921 is about 508.2935675304.

The spelling of 131323921 in words is "one hundred thirty-one million, three hundred twenty-three thousand, nine hundred twenty-one".