25157861 has 2 divisors, whose sum is σ = 25157862. Its totient is φ = 25157860.

The previous prime is 25157849. The next prime is 25157879. The reversal of 25157861 is 16875152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23961025 + 1196836 = 4895^2 + 1094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25157861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25157801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12578930 + 12578931.

It is an arithmetic number, because the mean of its divisors is an integer number (12578931).

Almost surely, 2^25157861 is an apocalyptic number.

It is an amenable number.

25157861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25157861 is an equidigital number, since it uses as much as digits as its factorization.

25157861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 35.

The square root of 25157861 is about 5015.7612582738. The cubic root of 25157861 is about 293.0159340890.

The spelling of 25157861 in words is "twenty-five million, one hundred fifty-seven thousand, eight hundred sixty-one".