25637993 has 2 divisors, whose sum is σ = 25637994. Its totient is φ = 25637992.

The previous prime is 25637971. The next prime is 25638047. The reversal of 25637993 is 39973652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25321024 + 316969 = 5032^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 25637993 - 2¹⁶ = 25572457 is a prime.

It is not a weakly prime, because it can be changed into another prime (25637903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12818996 + 12818997.

It is an arithmetic number, because the mean of its divisors is an integer number (12818997).

Almost surely, 2^25637993 is an apocalyptic number.

It is an amenable number.

25637993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25637993 is an equidigital number, since it uses as much as digits as its factorization.

25637993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 44.

The square root of 25637993 is about 5063.3973772557. The cubic root of 25637993 is about 294.8682472077.

The spelling of 25637993 in words is "twenty-five million, six hundred thirty-seven thousand, nine hundred ninety-three".