25918987 has 2 divisors, whose sum is σ = 25918988. Its totient is φ = 25918986.

The previous prime is 25918943. The next prime is 25918993. The reversal of 25918987 is 78981952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25918987 - 2⁷ = 25918859 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25918987.

It is not a weakly prime, because it can be changed into another prime (25918927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12959493 + 12959494.

It is an arithmetic number, because the mean of its divisors is an integer number (12959494).

Almost surely, 2^25918987 is an apocalyptic number.

25918987 is a deficient number, since it is larger than the sum of its proper divisors (1).

25918987 is an equidigital number, since it uses as much as digits as its factorization.

25918987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 25918987 is about 5091.0693375754. The cubic root of 25918987 is about 295.9415935101.

The spelling of 25918987 in words is "twenty-five million, nine hundred eighteen thousand, nine hundred eighty-seven".