25513861 has 2 divisors, whose sum is σ = 25513862. Its totient is φ = 25513860.

The previous prime is 25513847. The next prime is 25513871. The reversal of 25513861 is 16831552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 7924225 = 4194^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 25513861 - 2⁹ = 25513349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25513841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12756930 + 12756931.

It is an arithmetic number, because the mean of its divisors is an integer number (12756931).

Almost surely, 2^25513861 is an apocalyptic number.

It is an amenable number.

25513861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25513861 is an equidigital number, since it uses as much as digits as its factorization.

25513861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 25513861 is about 5051.1247262367. The cubic root of 25513861 is about 294.3915871998.

The spelling of 25513861 in words is "twenty-five million, five hundred thirteen thousand, eight hundred sixty-one".