25499321 has 2 divisors, whose sum is σ = 25499322. Its totient is φ = 25499320.

The previous prime is 25499291. The next prime is 25499359. The reversal of 25499321 is 12399452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12996025 + 12503296 = 3605^2 + 3536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25499321 is a prime.

It is a super-2 number, since 2×25499321² = 1300430742922082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25499021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12749660 + 12749661.

It is an arithmetic number, because the mean of its divisors is an integer number (12749661).

Almost surely, 2^25499321 is an apocalyptic number.

It is an amenable number.

25499321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25499321 is an equidigital number, since it uses as much as digits as its factorization.

25499321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 25499321 is about 5049.6852377153. The cubic root of 25499321 is about 294.3356533284.

The spelling of 25499321 in words is "twenty-five million, four hundred ninety-nine thousand, three hundred twenty-one".