25511651 has 4 divisors (see below), whose sum is σ = 27830904. Its totient is φ = 23192400.

The previous prime is 25511639. The next prime is 25511683. The reversal of 25511651 is 15611552.

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

It is not a de Polignac number, because 25511651 - 2¹⁸ = 25249507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25511651.

It is not an unprimeable number, because it can be changed into a prime (25511621) 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, 1159610 + ... + 1159631.

It is an arithmetic number, because the mean of its divisors is an integer number (6957726).

Almost surely, 2^25511651 is an apocalyptic number.

25511651 is a deficient number, since it is larger than the sum of its proper divisors (2319253).

25511651 is a wasteful number, since it uses less digits than its factorization.

25511651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319252.

The product of its digits is 1500, while the sum is 26.

The square root of 25511651 is about 5050.9059583405. The cubic root of 25511651 is about 294.3830869288.

Subtracting from 25511651 its reverse (15611552), we obtain a palindrome (9900099).

It can be divided in two parts, 25511 and 651, that added together give a palindrome (26162).

The spelling of 25511651 in words is "twenty-five million, five hundred eleven thousand, six hundred fifty-one".