25531361 has 2 divisors, whose sum is σ = 25531362. Its totient is φ = 25531360.

The previous prime is 25531351. The next prime is 25531409. The reversal of 25531361 is 16313552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 4774225 = 4556^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 25531361 - 2¹⁸ = 25269217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25531361.

It is not a weakly prime, because it can be changed into another prime (25531301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765680 + 12765681.

It is an arithmetic number, because the mean of its divisors is an integer number (12765681).

Almost surely, 2^25531361 is an apocalyptic number.

It is an amenable number.

25531361 is a deficient number, since it is larger than the sum of its proper divisors (1).

25531361 is an equidigital number, since it uses as much as digits as its factorization.

25531361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 25531361 is about 5052.8567167494. The cubic root of 25531361 is about 294.4588797111.

The spelling of 25531361 in words is "twenty-five million, five hundred thirty-one thousand, three hundred sixty-one".