25561357 has 2 divisors, whose sum is σ = 25561358. Its totient is φ = 25561356.

The previous prime is 25561331. The next prime is 25561369. The reversal of 25561357 is 75316552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16434916 + 9126441 = 4054^2 + 3021^2 .

It is a cyclic number.

It is not a de Polignac number, because 25561357 - 2¹¹ = 25559309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25561057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780678 + 12780679.

It is an arithmetic number, because the mean of its divisors is an integer number (12780679).

Almost surely, 2^25561357 is an apocalyptic number.

It is an amenable number.

25561357 is a deficient number, since it is larger than the sum of its proper divisors (1).

25561357 is an equidigital number, since it uses as much as digits as its factorization.

25561357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31500, while the sum is 34.

The square root of 25561357 is about 5055.8240673504. The cubic root of 25561357 is about 294.5741514321.

The spelling of 25561357 in words is "twenty-five million, five hundred sixty-one thousand, three hundred fifty-seven".