2531989 has 2 divisors, whose sum is σ = 2531990. Its totient is φ = 2531988.

The previous prime is 2531983. The next prime is 2531993. The reversal of 2531989 is 9891352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1800964 + 731025 = 1342^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531989 - 2³ = 2531981 is a prime.

It is a super-2 number, since 2×2531989² = 12821936592242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2531981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265994 + 1265995.

It is an arithmetic number, because the mean of its divisors is an integer number (1265995).

2^2531989 is an apocalyptic number.

It is an amenable number.

2531989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531989 is an equidigital number, since it uses as much as digits as its factorization.

2531989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 2531989 is about 1591.2224860151. Note that the first 3 decimals coincide. The cubic root of 2531989 is about 136.2973059089.

The spelling of 2531989 in words is "two million, five hundred thirty-one thousand, nine hundred eighty-nine".