131165989 has 2 divisors, whose sum is σ = 131165990. Its totient is φ = 131165988.

The previous prime is 131165971. The next prime is 131166001. The reversal of 131165989 is 989561131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78021889 + 53144100 = 8833^2 + 7290^2 .

It is a cyclic number.

It is not a de Polignac number, because 131165989 - 2¹⁵ = 131133221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131165939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65582994 + 65582995.

It is an arithmetic number, because the mean of its divisors is an integer number (65582995).

Almost surely, 2^131165989 is an apocalyptic number.

It is an amenable number.

131165989 is a deficient number, since it is larger than the sum of its proper divisors (1).

131165989 is an equidigital number, since it uses as much as digits as its factorization.

131165989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 43.

The square root of 131165989 is about 11452.7721098431. The cubic root of 131165989 is about 508.0897254558.

The spelling of 131165989 in words is "one hundred thirty-one million, one hundred sixty-five thousand, nine hundred eighty-nine".