25551131 has 4 divisors (see below), whose sum is σ = 25970064. Its totient is φ = 25132200.

The previous prime is 25551109. The next prime is 25551139. The reversal of 25551131 is 13115552.

It is a happy number.

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 25551131 - 2¹⁸ = 25288987 is a prime.

It is a super-2 number, since 2×25551131² = 1305720590758322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25551097 and 25551106.

It is not an unprimeable number, because it can be changed into a prime (25551139) 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, 209375 + ... + 209496.

It is an arithmetic number, because the mean of its divisors is an integer number (6492516).

Almost surely, 2^25551131 is an apocalyptic number.

25551131 is a deficient number, since it is larger than the sum of its proper divisors (418933).

25551131 is an equidigital number, since it uses as much as digits as its factorization.

25551131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418932.

The product of its digits is 750, while the sum is 23.

The square root of 25551131 is about 5054.8126572604. The cubic root of 25551131 is about 294.5348640413.

Adding to 25551131 its reverse (13115552), we get a palindrome (38666683).

The spelling of 25551131 in words is "twenty-five million, five hundred fifty-one thousand, one hundred thirty-one".