16131989 has 2 divisors, whose sum is σ = 16131990. Its totient is φ = 16131988.

The previous prime is 16131979. The next prime is 16132019. The reversal of 16131989 is 98913161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14569489 + 1562500 = 3817^2 + 1250^2 .

It is an emirp because it is prime and its reverse (98913161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16131989 - 2²⁰ = 15083413 is a prime.

It is a super-2 number, since 2×16131989² = 520482138192242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16131949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8065994 + 8065995.

It is an arithmetic number, because the mean of its divisors is an integer number (8065995).

Almost surely, 2^16131989 is an apocalyptic number.

It is an amenable number.

16131989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16131989 is an equidigital number, since it uses as much as digits as its factorization.

16131989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 38.

The square root of 16131989 is about 4016.4647390460. The cubic root of 16131989 is about 252.6752121813.

The spelling of 16131989 in words is "sixteen million, one hundred thirty-one thousand, nine hundred eighty-nine".