25102991 has 2 divisors, whose sum is σ = 25102992. Its totient is φ = 25102990.

The previous prime is 25102981. The next prime is 25102993. The reversal of 25102991 is 19920152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25102991 is a prime.

Together with 25102993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25102993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12551495 + 12551496.

It is an arithmetic number, because the mean of its divisors is an integer number (12551496).

Almost surely, 2^25102991 is an apocalyptic number.

25102991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25102991 is an equidigital number, since it uses as much as digits as its factorization.

25102991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 25102991 is about 5010.2885146466. The cubic root of 25102991 is about 292.8027537079.

The spelling of 25102991 in words is "twenty-five million, one hundred two thousand, nine hundred ninety-one".