25917551 has 4 divisors (see below), whose sum is σ = 28273704. Its totient is φ = 23561400.

The previous prime is 25917547. The next prime is 25917557. The reversal of 25917551 is 15571952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25917551 - 2² = 25917547 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 (25917557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178060 + ... + 1178081.

It is an arithmetic number, because the mean of its divisors is an integer number (7068426).

Almost surely, 2^25917551 is an apocalyptic number.

25917551 is a deficient number, since it is larger than the sum of its proper divisors (2356153).

25917551 is a wasteful number, since it uses less digits than its factorization.

25917551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356152.

The product of its digits is 15750, while the sum is 35.

The square root of 25917551 is about 5090.9283043469. The cubic root of 25917551 is about 295.9361280190.

The spelling of 25917551 in words is "twenty-five million, nine hundred seventeen thousand, five hundred fifty-one".