25491285 has 24 divisors (see below), whose sum is σ = 44598840. Its totient is φ = 13468032.

The previous prime is 25491259. The next prime is 25491311. The reversal of 25491285 is 58219452.

It is an interprime number because it is at equal distance from previous prime (25491259) and next prime (25491311).

It can be written as a sum of positive squares in 4 ways, for example, as 3896676 + 21594609 = 1974^2 + 4647^2 .

It is not a de Polignac number, because 25491285 - 2⁵ = 25491253 is a prime.

It is a super-2 number, since 2×25491285² = 1299611221902450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2307 + ... + 7503.

It is an arithmetic number, because the mean of its divisors is an integer number (1858285).

Almost surely, 2^25491285 is an apocalyptic number.

It is an amenable number.

25491285 is a deficient number, since it is larger than the sum of its proper divisors (19107555).

25491285 is a wasteful number, since it uses less digits than its factorization.

25491285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5317 (or 5314 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 25491285 is about 5048.8894818564. The cubic root of 25491285 is about 294.3047305465.

The spelling of 25491285 in words is "twenty-five million, four hundred ninety-one thousand, two hundred eighty-five".