25573997 has 2 divisors, whose sum is σ = 25573998. Its totient is φ = 25573996.

The previous prime is 25573979. The next prime is 25574009. The reversal of 25573997 is 79937552.

Together with previous prime (25573979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 2399401 = 4814^2 + 1549^2 .

It is a cyclic number.

It is not a de Polignac number, because 25573997 - 2⁸ = 25573741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25573937) 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, 12786998 + 12786999.

It is an arithmetic number, because the mean of its divisors is an integer number (12786999).

Almost surely, 2^25573997 is an apocalyptic number.

It is an amenable number.

25573997 is a deficient number, since it is larger than the sum of its proper divisors (1).

25573997 is an equidigital number, since it uses as much as digits as its factorization.

25573997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 595350, while the sum is 47.

The square root of 25573997 is about 5057.0739563506. The cubic root of 25573997 is about 294.6226987204.

The spelling of 25573997 in words is "twenty-five million, five hundred seventy-three thousand, nine hundred ninety-seven".