131323961 has 2 divisors, whose sum is σ = 131323962. Its totient is φ = 131323960.

The previous prime is 131323939. The next prime is 131323979. The reversal of 131323961 is 169323131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79210000 + 52113961 = 8900^2 + 7219^2 .

It is a cyclic number.

It is not a de Polignac number, because 131323961 - 2⁶ = 131323897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_7449023 and since 131323961 and 7449023 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (131323921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65661980 + 65661981.

It is an arithmetic number, because the mean of its divisors is an integer number (65661981).

Almost surely, 2^131323961 is an apocalyptic number.

It is an amenable number.

131323961 is a deficient number, since it is larger than the sum of its proper divisors (1).

131323961 is an equidigital number, since it uses as much as digits as its factorization.

131323961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 29.

The square root of 131323961 is about 11459.6667054500. Note that the first 3 decimals coincide. The cubic root of 131323961 is about 508.2936191375.

The spelling of 131323961 in words is "one hundred thirty-one million, three hundred twenty-three thousand, nine hundred sixty-one".