25621493 has 2 divisors, whose sum is σ = 25621494. Its totient is φ = 25621492.

The previous prime is 25621487. The next prime is 25621511. The reversal of 25621493 is 39412652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23833924 + 1787569 = 4882^2 + 1337^2 .

It is a cyclic number.

It is not a de Polignac number, because 25621493 - 2⁸ = 25621237 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25621423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810746 + 12810747.

It is an arithmetic number, because the mean of its divisors is an integer number (12810747).

Almost surely, 2^25621493 is an apocalyptic number.

It is an amenable number.

25621493 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621493 is an equidigital number, since it uses as much as digits as its factorization.

25621493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 25621493 is about 5061.7677742070. The cubic root of 25621493 is about 294.8049769121.

The spelling of 25621493 in words is "twenty-five million, six hundred twenty-one thousand, four hundred ninety-three".