249049521 has 24 divisors (see below), whose sum is σ = 411594560. Its totient is φ = 142153056.

The previous prime is 249049517. The next prime is 249049523. The reversal of 249049521 is 125940942.

249049521 is a `hidden beast` number, since 2 + 4 + 90 + 49 + 521 = 666.

249049521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 249049521 - 2² = 249049517 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249049523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74790 + ... + 78048.

Almost surely, 2^249049521 is an apocalyptic number.

249049521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

249049521 is a deficient number, since it is larger than the sum of its proper divisors (162545039).

249049521 is a wasteful number, since it uses less digits than its factorization.

249049521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4485 (or 4482 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 249049521 is about 15781.3028929807. The cubic root of 249049521 is about 629.1611587158.

The spelling of 249049521 in words is "two hundred forty-nine million, forty-nine thousand, five hundred twenty-one".