25610491 has 2 divisors, whose sum is σ = 25610492. Its totient is φ = 25610490.

The previous prime is 25610489. The next prime is 25610561. The reversal of 25610491 is 19401652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25610491 - 2¹ = 25610489 is a prime.

It is a super-2 number, since 2×25610491² = 1311794498522162, which contains 22 as substring.

Together with 25610489, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25610411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12805245 + 12805246.

It is an arithmetic number, because the mean of its divisors is an integer number (12805246).

Almost surely, 2^25610491 is an apocalyptic number.

25610491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25610491 is an equidigital number, since it uses as much as digits as its factorization.

25610491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 25610491 is about 5060.6808830433. The cubic root of 25610491 is about 294.7627739497.

The spelling of 25610491 in words is "twenty-five million, six hundred ten thousand, four hundred ninety-one".