249209725 has 12 divisors (see below), whose sum is σ = 316207936. Its totient is φ = 194730480.

The previous prime is 249209717. The next prime is 249209729. The reversal of 249209725 is 527902942.

It is not a de Polignac number, because 249209725 - 2³ = 249209717 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 (249209729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114837 + ... + 116986.

Almost surely, 2^249209725 is an apocalyptic number.

249209725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

249209725 is a deficient number, since it is larger than the sum of its proper divisors (66998211).

249209725 is a wasteful number, since it uses less digits than its factorization.

249209725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231876 (or 231871 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 249209725 is about 15786.3778302687. The cubic root of 249209725 is about 629.2960348765.

The spelling of 249209725 in words is "two hundred forty-nine million, two hundred nine thousand, seven hundred twenty-five".