25225981 has 16 divisors (see below), whose sum is σ = 28615680. Its totient is φ = 22037680.

The previous prime is 25225961. The next prime is 25225997. The reversal of 25225981 is 18952252.

It is a happy number.

It is not a de Polignac number, because 25225981 - 2⁹ = 25225469 is a prime.

It is a super-2 number, since 2×25225981² = 1272700234824722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25225931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30090 + ... + 30916.

It is an arithmetic number, because the mean of its divisors is an integer number (1788480).

Almost surely, 2^25225981 is an apocalyptic number.

It is an amenable number.

25225981 is a deficient number, since it is larger than the sum of its proper divisors (3389699).

25225981 is a wasteful number, since it uses less digits than its factorization.

25225981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944.

The product of its digits is 14400, while the sum is 34.

The square root of 25225981 is about 5022.5472620972. The cubic root of 25225981 is about 293.2801623954.

The spelling of 25225981 in words is "twenty-five million, two hundred twenty-five thousand, nine hundred eighty-one".