25710991 has 2 divisors, whose sum is σ = 25710992. Its totient is φ = 25710990.

The previous prime is 25710973. The next prime is 25711001. The reversal of 25710991 is 19901752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25710991 - 2⁵ = 25710959 is a prime.

It is a super-2 number, since 2×25710991² = 1322110116404162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25710901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12855495 + 12855496.

It is an arithmetic number, because the mean of its divisors is an integer number (12855496).

Almost surely, 2^25710991 is an apocalyptic number.

25710991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25710991 is an equidigital number, since it uses as much as digits as its factorization.

25710991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 25710991 is about 5070.6006547548. The cubic root of 25710991 is about 295.1478374195.

The spelling of 25710991 in words is "twenty-five million, seven hundred ten thousand, nine hundred ninety-one".