25870551 has 16 divisors (see below), whose sum is σ = 39492864. Its totient is φ = 14756544.

The previous prime is 25870547. The next prime is 25870553. The reversal of 25870551 is 15507852.

It is a happy number.

It is not a de Polignac number, because 25870551 - 2² = 25870547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25870553) 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, 22476 + ... + 23598.

It is an arithmetic number, because the mean of its divisors is an integer number (2468304).

Almost surely, 2^25870551 is an apocalyptic number.

25870551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25870551 is a deficient number, since it is larger than the sum of its proper divisors (13622313).

25870551 is a wasteful number, since it uses less digits than its factorization.

25870551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230.

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 25870551 is about 5086.3101557023. The cubic root of 25870551 is about 295.7571320146.

The spelling of 25870551 in words is "twenty-five million, eight hundred seventy thousand, five hundred fifty-one".