25131989 has 4 divisors (see below), whose sum is σ = 25149324. Its totient is φ = 25114656.

The previous prime is 25131983. The next prime is 25132007. The reversal of 25131989 is 98913152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14569489 + 10562500 = 3817^2 + 3250^2 .

It is a cyclic number.

It is not a de Polignac number, because 25131989 - 2⁴ = 25131973 is a prime.

It is a super-2 number, since 2×25131989² = 1263233742192242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25131983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6272 + ... + 9465.

It is an arithmetic number, because the mean of its divisors is an integer number (6287331).

Almost surely, 2^25131989 is an apocalyptic number.

It is an amenable number.

25131989 is a deficient number, since it is larger than the sum of its proper divisors (17335).

25131989 is a wasteful number, since it uses less digits than its factorization.

25131989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17334.

The product of its digits is 19440, while the sum is 38.

The square root of 25131989 is about 5013.1815247406. The cubic root of 25131989 is about 292.9154551117.

The spelling of 25131989 in words is "twenty-five million, one hundred thirty-one thousand, nine hundred eighty-nine".