25570997 has 2 divisors, whose sum is σ = 25570998. Its totient is φ = 25570996.

The previous prime is 25570991. The next prime is 25571023. The reversal of 25570997 is 79907552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 9897316 = 3959^2 + 3146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25570997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25570991) 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, 12785498 + 12785499.

It is an arithmetic number, because the mean of its divisors is an integer number (12785499).

Almost surely, 2^25570997 is an apocalyptic number.

It is an amenable number.

25570997 is a deficient number, since it is larger than the sum of its proper divisors (1).

25570997 is an equidigital number, since it uses as much as digits as its factorization.

25570997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 25570997 is about 5056.7773334407. Note that the first 3 decimals coincide. The cubic root of 25570997 is about 294.6111778690.

The spelling of 25570997 in words is "twenty-five million, five hundred seventy thousand, nine hundred ninety-seven".