25531389 has 16 divisors (see below), whose sum is σ = 40734400. Its totient is φ = 15711408.

The previous prime is 25531361. The next prime is 25531409. The reversal of 25531389 is 98313552.

It is not a de Polignac number, because 25531389 - 2⁹ = 25530877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25531349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36019 + ... + 36720.

It is an arithmetic number, because the mean of its divisors is an integer number (2545900).

Almost surely, 2^25531389 is an apocalyptic number.

It is an amenable number.

25531389 is a deficient number, since it is larger than the sum of its proper divisors (15203011).

25531389 is a wasteful number, since it uses less digits than its factorization.

25531389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72761 (or 72755 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 25531389 is about 5052.8594874586. The cubic root of 25531389 is about 294.4589873544.

The spelling of 25531389 in words is "twenty-five million, five hundred thirty-one thousand, three hundred eighty-nine".