25919797 has 2 divisors, whose sum is σ = 25919798. Its totient is φ = 25919796.

The previous prime is 25919783. The next prime is 25919801. The reversal of 25919797 is 79791952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21215236 + 4704561 = 4606^2 + 2169^2 .

It is a cyclic number.

It is not a de Polignac number, because 25919797 - 2¹⁹ = 25395509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25919797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25919717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12959898 + 12959899.

It is an arithmetic number, because the mean of its divisors is an integer number (12959899).

Almost surely, 2^25919797 is an apocalyptic number.

It is an amenable number.

25919797 is a deficient number, since it is larger than the sum of its proper divisors (1).

25919797 is an equidigital number, since it uses as much as digits as its factorization.

25919797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 357210, while the sum is 49.

The square root of 25919797 is about 5091.1488880212. The cubic root of 25919797 is about 295.9446763234.

The spelling of 25919797 in words is "twenty-five million, nine hundred nineteen thousand, seven hundred ninety-seven".