25491065 has 16 divisors (see below), whose sum is σ = 32430720. Its totient is φ = 19180800.

The previous prime is 25491019. The next prime is 25491079. The reversal of 25491065 is 56019452.

It is a happy number.

It is not a de Polignac number, because 25491065 - 2⁶ = 25491001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13457 + ... + 15233.

It is an arithmetic number, because the mean of its divisors is an integer number (2026920).

Almost surely, 2^25491065 is an apocalyptic number.

It is an amenable number.

25491065 is a deficient number, since it is larger than the sum of its proper divisors (6939655).

25491065 is a wasteful number, since it uses less digits than its factorization.

25491065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 25491065 is about 5048.8676948401. The cubic root of 25491065 is about 294.3038838882.

It can be divided in two parts, 254 and 91065, that added together give a palindrome (91319).

The spelling of 25491065 in words is "twenty-five million, four hundred ninety-one thousand, sixty-five".