25551551 has 8 divisors (see below), whose sum is σ = 27039744. Its totient is φ = 24094840.

The previous prime is 25551541. The next prime is 25551553. The reversal of 25551551 is 15515552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25551551 - 2²² = 21357247 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 (25551553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6191 + ... + 9456.

It is an arithmetic number, because the mean of its divisors is an integer number (3379968).

Almost surely, 2^25551551 is an apocalyptic number.

25551551 is a deficient number, since it is larger than the sum of its proper divisors (1488193).

25551551 is a wasteful number, since it uses less digits than its factorization.

25551551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15741.

The product of its digits is 6250, while the sum is 29.

The square root of 25551551 is about 5054.8542016561. The cubic root of 25551551 is about 294.5364778507.

The spelling of 25551551 in words is "twenty-five million, five hundred fifty-one thousand, five hundred fifty-one".