25613761 has 2 divisors, whose sum is σ = 25613762. Its totient is φ = 25613760.

The previous prime is 25613759. The next prime is 25613771. The reversal of 25613761 is 16731652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25563136 + 50625 = 5056^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 25613761 - 2¹ = 25613759 is a prime.

Together with 25613759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25613711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12806880 + 12806881.

It is an arithmetic number, because the mean of its divisors is an integer number (12806881).

Almost surely, 2^25613761 is an apocalyptic number.

It is an amenable number.

25613761 is a deficient number, since it is larger than the sum of its proper divisors (1).

25613761 is an equidigital number, since it uses as much as digits as its factorization.

25613761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 25613761 is about 5061.0039517866. The cubic root of 25613761 is about 294.7753187209.

The spelling of 25613761 in words is "twenty-five million, six hundred thirteen thousand, seven hundred sixty-one".