25547979 has 4 divisors (see below), whose sum is σ = 34063976. Its totient is φ = 17031984.

The previous prime is 25547953. The next prime is 25548049. The reversal of 25547979 is 97974552.

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

It is not a de Polignac number, because 25547979 - 2¹¹ = 25545931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25547939) 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 in 3 ways as a sum of consecutive naturals, for example, 4257994 + ... + 4257999.

It is an arithmetic number, because the mean of its divisors is an integer number (8515994).

Almost surely, 2^25547979 is an apocalyptic number.

25547979 is a deficient number, since it is larger than the sum of its proper divisors (8515997).

25547979 is an equidigital number, since it uses as much as digits as its factorization.

25547979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8515996.

The product of its digits is 793800, while the sum is 48.

The square root of 25547979 is about 5054.5008655653. The cubic root of 25547979 is about 294.5227522217.

The spelling of 25547979 in words is "twenty-five million, five hundred forty-seven thousand, nine hundred seventy-nine".