131312989 has 2 divisors, whose sum is σ = 131312990. Its totient is φ = 131312988.

The previous prime is 131312969. The next prime is 131313001. The reversal of 131312989 is 989213131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131285764 + 27225 = 11458^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 131312989 - 2¹⁷ = 131181917 is a prime.

It is a super-2 number, since 2×131312989² = 34486202160228242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131312939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65656494 + 65656495.

It is an arithmetic number, because the mean of its divisors is an integer number (65656495).

Almost surely, 2^131312989 is an apocalyptic number.

It is an amenable number.

131312989 is a deficient number, since it is larger than the sum of its proper divisors (1).

131312989 is an equidigital number, since it uses as much as digits as its factorization.

131312989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 131312989 is about 11459.1879729761. The cubic root of 131312989 is about 508.2794629168.

The spelling of 131312989 in words is "one hundred thirty-one million, three hundred twelve thousand, nine hundred eighty-nine".