2131199989 has 2 divisors, whose sum is σ = 2131199990. Its totient is φ = 2131199988.

The previous prime is 2131199981. The next prime is 2131200011. The reversal of 2131199989 is 9899911312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1735388964 + 395811025 = 41658^2 + 19895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131199989 - 2³ = 2131199981 is a prime.

It is a super-2 number, since 2×2131199989² = 9084026786227200242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131199981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065599994 + 1065599995.

It is an arithmetic number, because the mean of its divisors is an integer number (1065599995).

Almost surely, 2^2131199989 is an apocalyptic number.

It is an amenable number.

2131199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131199989 is an equidigital number, since it uses as much as digits as its factorization.

2131199989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 52.

The square root of 2131199989 is about 46164.9216288732. The cubic root of 2131199989 is about 1286.8899277520.

The spelling of 2131199989 in words is "two billion, one hundred thirty-one million, one hundred ninety-nine thousand, nine hundred eighty-nine".