25632521 has 2 divisors, whose sum is σ = 25632522. Its totient is φ = 25632520.

The previous prime is 25632517. The next prime is 25632533. The reversal of 25632521 is 12523652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 1974025 = 4864^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 25632521 - 2² = 25632517 is a prime.

It is a super-2 number, since 2×25632521² = 1314052265630882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (25632571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12816260 + 12816261.

It is an arithmetic number, because the mean of its divisors is an integer number (12816261).

Almost surely, 2^25632521 is an apocalyptic number.

It is an amenable number.

25632521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25632521 is an equidigital number, since it uses as much as digits as its factorization.

25632521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 26.

The square root of 25632521 is about 5062.8569997581. The cubic root of 25632521 is about 294.8472674862.

The spelling of 25632521 in words is "twenty-five million, six hundred thirty-two thousand, five hundred twenty-one".