131390689 has 2 divisors, whose sum is σ = 131390690. Its totient is φ = 131390688.

The previous prime is 131390639. The next prime is 131390713. The reversal of 131390689 is 986093131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125821089 + 5569600 = 11217^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 131390689 - 2⁹ = 131390177 is a prime.

It is not a weakly prime, because it can be changed into another prime (131390639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65695344 + 65695345.

It is an arithmetic number, because the mean of its divisors is an integer number (65695345).

Almost surely, 2^131390689 is an apocalyptic number.

It is an amenable number.

131390689 is a deficient number, since it is larger than the sum of its proper divisors (1).

131390689 is an equidigital number, since it uses as much as digits as its factorization.

131390689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 131390689 is about 11462.5777641855. The cubic root of 131390689 is about 508.3796955176.

The spelling of 131390689 in words is "one hundred thirty-one million, three hundred ninety thousand, six hundred eighty-nine".