25521612 has 12 divisors (see below), whose sum is σ = 59550456. Its totient is φ = 8507200.

The previous prime is 25521583. The next prime is 25521619. The reversal of 25521612 is 21612552.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (25521619) 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 3 ways as a sum of consecutive naturals, for example, 1063389 + ... + 1063412.

It is an arithmetic number, because the mean of its divisors is an integer number (4962538).

Almost surely, 2^25521612 is an apocalyptic number.

It is an amenable number.

25521612 is an abundant number, since it is smaller than the sum of its proper divisors (34028844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25521612 is a wasteful number, since it uses less digits than its factorization.

25521612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126808 (or 2126806 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 25521612 is about 5051.8919228345. The cubic root of 25521612 is about 294.4213958093.

The spelling of 25521612 in words is "twenty-five million, five hundred twenty-one thousand, six hundred twelve".