25869491 has 2 divisors, whose sum is σ = 25869492. Its totient is φ = 25869490.

The previous prime is 25869439. The next prime is 25869509. The reversal of 25869491 is 19496852.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25869491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25869091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12934745 + 12934746.

It is an arithmetic number, because the mean of its divisors is an integer number (12934746).

Almost surely, 2^25869491 is an apocalyptic number.

25869491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25869491 is an equidigital number, since it uses as much as digits as its factorization.

25869491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 25869491 is about 5086.2059533605. The cubic root of 25869491 is about 295.7530925846.

The spelling of 25869491 in words is "twenty-five million, eight hundred sixty-nine thousand, four hundred ninety-one".