25431849 has 15 divisors (see below), whose sum is σ = 37653265. Its totient is φ = 16541040.

The previous prime is 25431817. The next prime is 25431851. The reversal of 25431849 is 94813452.

The square root of 25431849 is 5043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 20766249 + 4665600 = 4557^2 + 2160^2 .

It is not a de Polignac number, because 25431849 - 2⁵ = 25431817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25431349) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 620269 + ... + 620309.

Almost surely, 2^25431849 is an apocalyptic number.

25431849 is the 5043-rd square number.

25431849 is the 2522-nd centered octagonal number.

It is an amenable number.

25431849 is a deficient number, since it is larger than the sum of its proper divisors (12221416).

25431849 is an frugal number, since it uses more digits than its factorization.

25431849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 44 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The cubic root of 25431849 is about 294.0758169036.

Multiplying 25431849 by its sum of digits (36), we get a square (915546564 = 30258²).

The spelling of 25431849 in words is "twenty-five million, four hundred thirty-one thousand, eight hundred forty-nine".