249779925 has 18 divisors (see below), whose sum is σ = 447384002. Its totient is φ = 133215840.

The previous prime is 249779921. The next prime is 249779983. The reversal of 249779925 is 529977942.

It can be written as a sum of positive squares in 3 ways, for example, as 64112049 + 185667876 = 8007^2 + 13626^2 .

It is not a de Polignac number, because 249779925 - 2² = 249779921 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 (249779921) 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 17 ways as a sum of consecutive naturals, for example, 554842 + ... + 555291.

Almost surely, 2^249779925 is an apocalyptic number.

249779925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

249779925 is a deficient number, since it is larger than the sum of its proper divisors (197604077).

249779925 is a wasteful number, since it uses less digits than its factorization.

249779925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110149 (or 1110141 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 249779925 is about 15804.4273860207. The cubic root of 249779925 is about 629.7756192626.

The spelling of 249779925 in words is "two hundred forty-nine million, seven hundred seventy-nine thousand, nine hundred twenty-five".