25687913 has 2 divisors, whose sum is σ = 25687914. Its totient is φ = 25687912.

The previous prime is 25687903. The next prime is 25687927. The reversal of 25687913 is 31978652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16908544 + 8779369 = 4112^2 + 2963^2 .

It is a cyclic number.

It is not a de Polignac number, because 25687913 - 2¹² = 25683817 is a prime.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (25687903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12843956 + 12843957.

It is an arithmetic number, because the mean of its divisors is an integer number (12843957).

Almost surely, 2^25687913 is an apocalyptic number.

It is an amenable number.

25687913 is a deficient number, since it is larger than the sum of its proper divisors (1).

25687913 is an equidigital number, since it uses as much as digits as its factorization.

25687913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 25687913 is about 5068.3244765899. The cubic root of 25687913 is about 295.0595034619.

The spelling of 25687913 in words is "twenty-five million, six hundred eighty-seven thousand, nine hundred thirteen".