25515761 has 2 divisors, whose sum is σ = 25515762. Its totient is φ = 25515760.

The previous prime is 25515757. The next prime is 25515769. The reversal of 25515761 is 16751552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22505536 + 3010225 = 4744^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 25515761 - 2² = 25515757 is a prime.

It is a super-3 number, since 3×25515761³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25515769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12757880 + 12757881.

It is an arithmetic number, because the mean of its divisors is an integer number (12757881).

Almost surely, 2^25515761 is an apocalyptic number.

It is an amenable number.

25515761 is a deficient number, since it is larger than the sum of its proper divisors (1).

25515761 is an equidigital number, since it uses as much as digits as its factorization.

25515761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10500, while the sum is 32.

The square root of 25515761 is about 5051.3127996591. The cubic root of 25515761 is about 294.3988947326.

The spelling of 25515761 in words is "twenty-five million, five hundred fifteen thousand, seven hundred sixty-one".