25023991 has 2 divisors, whose sum is σ = 25023992. Its totient is φ = 25023990.

The previous prime is 25023959. The next prime is 25024001. The reversal of 25023991 is 19932052.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25023991 - 2⁵ = 25023959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25023941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12511995 + 12511996.

It is an arithmetic number, because the mean of its divisors is an integer number (12511996).

Almost surely, 2^25023991 is an apocalyptic number.

25023991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25023991 is an equidigital number, since it uses as much as digits as its factorization.

25023991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 25023991 is about 5002.3985247079. The cubic root of 25023991 is about 292.4952773971.

The spelling of 25023991 in words is "twenty-five million, twenty-three thousand, nine hundred ninety-one".