25405331 has 12 divisors (see below), whose sum is σ = 29401008. Its totient is φ = 21504432.

The previous prime is 25405319. The next prime is 25405339. The reversal of 25405331 is 13350452.

It is a de Polignac number, because none of the positive numbers 2^k-25405331 is a prime.

It is a super-2 number, since 2×25405331² = 1290861686439122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25405297 and 25405306.

It is not an unprimeable number, because it can be changed into a prime (25405339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79985 + ... + 80301.

It is an arithmetic number, because the mean of its divisors is an integer number (2450084).

Almost surely, 2^25405331 is an apocalyptic number.

25405331 is a deficient number, since it is larger than the sum of its proper divisors (3995677).

25405331 is an equidigital number, since it uses as much as digits as its factorization.

25405331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 25405331 is about 5040.3701252983. The cubic root of 25405331 is about 293.9735695925.

Adding to 25405331 its reverse (13350452), we get a palindrome (38755783).

The spelling of 25405331 in words is "twenty-five million, four hundred five thousand, three hundred thirty-one".