25476991 has 4 divisors (see below), whose sum is σ = 25519984. Its totient is φ = 25434000.

The previous prime is 25476959. The next prime is 25477007. The reversal of 25476991 is 19967452.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25476991 - 2⁵ = 25476959 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 (25476901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20595 + ... + 21796.

It is an arithmetic number, because the mean of its divisors is an integer number (6379996).

Almost surely, 2^25476991 is an apocalyptic number.

25476991 is a deficient number, since it is larger than the sum of its proper divisors (42993).

25476991 is an equidigital number, since it uses as much as digits as its factorization.

25476991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42992.

The product of its digits is 136080, while the sum is 43.

The square root of 25476991 is about 5047.4737245478. The cubic root of 25476991 is about 294.2497107183.

The spelling of 25476991 in words is "twenty-five million, four hundred seventy-six thousand, nine hundred ninety-one".