25099979 has 4 divisors (see below), whose sum is σ = 25110000. Its totient is φ = 25089960.

The previous prime is 25099961. The next prime is 25099999. The reversal of 25099979 is 97999052.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25099979 - 2¹² = 25095883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25099999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2489 + ... + 7509.

It is an arithmetic number, because the mean of its divisors is an integer number (6277500).

Almost surely, 2^25099979 is an apocalyptic number.

25099979 is a deficient number, since it is larger than the sum of its proper divisors (10021).

25099979 is an equidigital number, since it uses as much as digits as its factorization.

25099979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10020.

The product of its (nonzero) digits is 459270, while the sum is 50.

The square root of 25099979 is about 5009.9879241371. The cubic root of 25099979 is about 292.7910425249.

The spelling of 25099979 in words is "twenty-five million, ninety-nine thousand, nine hundred seventy-nine".