25551231 has 4 divisors (see below), whose sum is σ = 34068312. Its totient is φ = 17034152.

The previous prime is 25551217. The next prime is 25551263. The reversal of 25551231 is 13215552.

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 25551231 - 2¹⁷ = 25420159 is a prime.

It is a super-2 number, since 2×25551231² = 1305730811230722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25551271) 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, 4258536 + ... + 4258541.

It is an arithmetic number, because the mean of its divisors is an integer number (8517078).

Almost surely, 2^25551231 is an apocalyptic number.

25551231 is a deficient number, since it is larger than the sum of its proper divisors (8517081).

25551231 is an equidigital number, since it uses as much as digits as its factorization.

25551231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8517080.

The product of its digits is 1500, while the sum is 24.

The square root of 25551231 is about 5054.8225488142. The cubic root of 25551231 is about 294.5352482833.

Adding to 25551231 its reverse (13215552), we get a palindrome (38766783).

The spelling of 25551231 in words is "twenty-five million, five hundred fifty-one thousand, two hundred thirty-one".