25135551 has 12 divisors (see below), whose sum is σ = 41493712. Its totient is φ = 14363136.

The previous prime is 25135541. The next prime is 25135559. The reversal of 25135551 is 15553152.

It is not a de Polignac number, because 25135551 - 2²³ = 16746943 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 (25135559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199426 + ... + 199551.

Almost surely, 2^25135551 is an apocalyptic number.

25135551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25135551 is a deficient number, since it is larger than the sum of its proper divisors (16358161).

25135551 is a wasteful number, since it uses less digits than its factorization.

25135551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398990 (or 398987 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 25135551 is about 5013.5367755707. The cubic root of 25135551 is about 292.9292929283.

The spelling of 25135551 in words is "twenty-five million, one hundred thirty-five thousand, five hundred fifty-one".