25391963 has 2 divisors, whose sum is σ = 25391964. Its totient is φ = 25391962.

The previous prime is 25391909. The next prime is 25391969. The reversal of 25391963 is 36919352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25391963 - 2¹⁴ = 25375579 is a prime.

It is not a weakly prime, because it can be changed into another prime (25391969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695981 + 12695982.

It is an arithmetic number, because the mean of its divisors is an integer number (12695982).

Almost surely, 2^25391963 is an apocalyptic number.

25391963 is a deficient number, since it is larger than the sum of its proper divisors (1).

25391963 is an equidigital number, since it uses as much as digits as its factorization.

25391963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 38.

The square root of 25391963 is about 5039.0438577175. The cubic root of 25391963 is about 293.9219986819.

The spelling of 25391963 in words is "twenty-five million, three hundred ninety-one thousand, nine hundred sixty-three".