131120989 has 2 divisors, whose sum is σ = 131120990. Its totient is φ = 131120988.

The previous prime is 131120987. The next prime is 131121031. The reversal of 131120989 is 989021131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101505625 + 29615364 = 10075^2 + 5442^2 .

It is a cyclic number.

It is not a de Polignac number, because 131120989 - 2¹ = 131120987 is a prime.

Together with 131120987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131120987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65560494 + 65560495.

It is an arithmetic number, because the mean of its divisors is an integer number (65560495).

Almost surely, 2^131120989 is an apocalyptic number.

It is an amenable number.

131120989 is a deficient number, since it is larger than the sum of its proper divisors (1).

131120989 is an equidigital number, since it uses as much as digits as its factorization.

131120989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 131120989 is about 11450.8073514491. The cubic root of 131120989 is about 508.0316142208.

The spelling of 131120989 in words is "one hundred thirty-one million, one hundred twenty thousand, nine hundred eighty-nine".