25542997 has 4 divisors (see below), whose sum is σ = 26423820. Its totient is φ = 24662176.

The previous prime is 25542983. The next prime is 25543019. The reversal of 25542997 is 79924552.

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 13439556 + 12103441 = 3666^2 + 3479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25542997 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 (25542917) 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 in 3 ways as a sum of consecutive naturals, for example, 440368 + ... + 440425.

It is an arithmetic number, because the mean of its divisors is an integer number (6605955).

Almost surely, 2^25542997 is an apocalyptic number.

It is an amenable number.

25542997 is a deficient number, since it is larger than the sum of its proper divisors (880823).

25542997 is an equidigital number, since it uses as much as digits as its factorization.

25542997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880822.

The product of its digits is 226800, while the sum is 43.

The square root of 25542997 is about 5054.0080134483. The cubic root of 25542997 is about 294.5036064445.

The spelling of 25542997 in words is "twenty-five million, five hundred forty-two thousand, nine hundred ninety-seven".