210131989 has 2 divisors, whose sum is σ = 210131990. Its totient is φ = 210131988.

The previous prime is 210131959. The next prime is 210131993. The reversal of 210131989 is 989131012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202123089 + 8008900 = 14217^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 210131989 - 2²⁷ = 75914261 is a prime.

It is a super-2 number, since 2×210131989² = 88310905602192242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210131959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105065994 + 105065995.

It is an arithmetic number, because the mean of its divisors is an integer number (105065995).

Almost surely, 2^210131989 is an apocalyptic number.

It is an amenable number.

210131989 is a deficient number, since it is larger than the sum of its proper divisors (1).

210131989 is an equidigital number, since it uses as much as digits as its factorization.

210131989 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 210131989 is about 14495.9300839925. The cubic root of 210131989 is about 594.5166981346.

The spelling of 210131989 in words is "two hundred ten million, one hundred thirty-one thousand, nine hundred eighty-nine".