25397551 has 2 divisors, whose sum is σ = 25397552. Its totient is φ = 25397550.

The previous prime is 25397549. The next prime is 25397569. The reversal of 25397551 is 15579352.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25397551 - 2¹ = 25397549 is a prime.

Together with 25397549, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25397551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25397521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12698775 + 12698776.

It is an arithmetic number, because the mean of its divisors is an integer number (12698776).

Almost surely, 2^25397551 is an apocalyptic number.

25397551 is a deficient number, since it is larger than the sum of its proper divisors (1).

25397551 is an equidigital number, since it uses as much as digits as its factorization.

25397551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47250, while the sum is 37.

The square root of 25397551 is about 5039.5982974836. The cubic root of 25397551 is about 293.9435582027.

The spelling of 25397551 in words is "twenty-five million, three hundred ninety-seven thousand, five hundred fifty-one".