25615989131 has 2 divisors, whose sum is σ = 25615989132. Its totient is φ = 25615989130.

The previous prime is 25615989083. The next prime is 25615989137. The reversal of 25615989131 is 13198951652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25615989131 is a prime.

It is a super-2 number, since 2×25615989131² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25615989131.

It is not a weakly prime, because it can be changed into another prime (25615989137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12807994565 + 12807994566.

It is an arithmetic number, because the mean of its divisors is an integer number (12807994566).

Almost surely, 2^25615989131 is an apocalyptic number.

25615989131 is a deficient number, since it is larger than the sum of its proper divisors (1).

25615989131 is an equidigital number, since it uses as much as digits as its factorization.

25615989131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 50.

The spelling of 25615989131 in words is "twenty-five billion, six hundred fifteen million, nine hundred eighty-nine thousand, one hundred thirty-one".