131177989 has 2 divisors, whose sum is σ = 131177990. Its totient is φ = 131177988.

The previous prime is 131177939. The next prime is 131178017. The reversal of 131177989 is 989771131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71115489 + 60062500 = 8433^2 + 7750^2 .

It is a cyclic number.

It is not a de Polignac number, because 131177989 - 2¹⁷ = 131046917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131177909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65588994 + 65588995.

It is an arithmetic number, because the mean of its divisors is an integer number (65588995).

Almost surely, 2^131177989 is an apocalyptic number.

It is an amenable number.

131177989 is a deficient number, since it is larger than the sum of its proper divisors (1).

131177989 is an equidigital number, since it uses as much as digits as its factorization.

131177989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 46.

The square root of 131177989 is about 11453.2959884917. The cubic root of 131177989 is about 508.1052195404.

The spelling of 131177989 in words is "one hundred thirty-one million, one hundred seventy-seven thousand, nine hundred eighty-nine".