25306991 has 2 divisors, whose sum is σ = 25306992. Its totient is φ = 25306990.

The previous prime is 25306979. The next prime is 25307011. The reversal of 25306991 is 19960352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25306991 - 2¹⁴ = 25290607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25306921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12653495 + 12653496.

It is an arithmetic number, because the mean of its divisors is an integer number (12653496).

Almost surely, 2^25306991 is an apocalyptic number.

25306991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25306991 is an equidigital number, since it uses as much as digits as its factorization.

25306991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 25306991 is about 5030.6054307608. The cubic root of 25306991 is about 293.5937707957.

The spelling of 25306991 in words is "twenty-five million, three hundred six thousand, nine hundred ninety-one".