25136491 has 2 divisors, whose sum is σ = 25136492. Its totient is φ = 25136490.

The previous prime is 25136473. The next prime is 25136497. The reversal of 25136491 is 19463152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25136491 - 2⁵ = 25136459 is a prime.

It is not a weakly prime, because it can be changed into another prime (25136497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12568245 + 12568246.

It is an arithmetic number, because the mean of its divisors is an integer number (12568246).

Almost surely, 2^25136491 is an apocalyptic number.

25136491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25136491 is an equidigital number, since it uses as much as digits as its factorization.

25136491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 25136491 is about 5013.6305208900. The cubic root of 25136491 is about 292.9329444642.

The spelling of 25136491 in words is "twenty-five million, one hundred thirty-six thousand, four hundred ninety-one".