25655531 has 4 divisors (see below), whose sum is σ = 27987864. Its totient is φ = 23323200.

The previous prime is 25655519. The next prime is 25655537. The reversal of 25655531 is 13555652.

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 25655531 - 2¹⁰ = 25654507 is a prime.

It is a super-2 number, since 2×25655531² = 1316412541783922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25655537) 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, 1166150 + ... + 1166171.

It is an arithmetic number, because the mean of its divisors is an integer number (6996966).

Almost surely, 2^25655531 is an apocalyptic number.

25655531 is a deficient number, since it is larger than the sum of its proper divisors (2332333).

25655531 is a wasteful number, since it uses less digits than its factorization.

25655531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332332.

The product of its digits is 22500, while the sum is 32.

The square root of 25655531 is about 5065.1289223474. The cubic root of 25655531 is about 294.9354680256.

It can be divided in two parts, 25 and 655531, that added together give a palindrome (655556).

The spelling of 25655531 in words is "twenty-five million, six hundred fifty-five thousand, five hundred thirty-one".