25356997 has 4 divisors (see below), whose sum is σ = 25589740. Its totient is φ = 25124256.

The previous prime is 25356953. The next prime is 25357009. The reversal of 25356997 is 79965352.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7834401 + 17522596 = 2799^2 + 4186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25356997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25356937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116208 + ... + 116425.

It is an arithmetic number, because the mean of its divisors is an integer number (6397435).

Almost surely, 2^25356997 is an apocalyptic number.

It is an amenable number.

25356997 is a deficient number, since it is larger than the sum of its proper divisors (232743).

25356997 is a wasteful number, since it uses less digits than its factorization.

25356997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232742.

The product of its digits is 510300, while the sum is 46.

The square root of 25356997 is about 5035.5731550639. The cubic root of 25356997 is about 293.7870216203.

The spelling of 25356997 in words is "twenty-five million, three hundred fifty-six thousand, nine hundred ninety-seven".