25449997 has 2 divisors, whose sum is σ = 25449998. Its totient is φ = 25449996.

The previous prime is 25449989. The next prime is 25450001. The reversal of 25449997 is 79994452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16859236 + 8590761 = 4106^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 25449997 - 2³ = 25449989 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25449997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25449947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12724998 + 12724999.

It is an arithmetic number, because the mean of its divisors is an integer number (12724999).

Almost surely, 2^25449997 is an apocalyptic number.

It is an amenable number.

25449997 is a deficient number, since it is larger than the sum of its proper divisors (1).

25449997 is an equidigital number, since it uses as much as digits as its factorization.

25449997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 25449997 is about 5044.7990049159. The cubic root of 25449997 is about 294.1457504605.

The spelling of 25449997 in words is "twenty-five million, four hundred forty-nine thousand, nine hundred ninety-seven".