25311491 has 2 divisors, whose sum is σ = 25311492. Its totient is φ = 25311490.

The previous prime is 25311467. The next prime is 25311493. The reversal of 25311491 is 19411352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25311491 - 2¹⁴ = 25295107 is a prime.

Together with 25311493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25311491.

It is not a weakly prime, because it can be changed into another prime (25311493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12655745 + 12655746.

It is an arithmetic number, because the mean of its divisors is an integer number (12655746).

Almost surely, 2^25311491 is an apocalyptic number.

25311491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25311491 is an equidigital number, since it uses as much as digits as its factorization.

25311491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 25311491 is about 5031.0526731490. The cubic root of 25311491 is about 293.6111717011.

The spelling of 25311491 in words is "twenty-five million, three hundred eleven thousand, four hundred ninety-one".