249603813 has 24 divisors (see below), whose sum is σ = 371987928. Its totient is φ = 161160192.

The previous prime is 249603773. The next prime is 249603833. The reversal of 249603813 is 318306942.

249603813 is a `hidden beast` number, since 2 + 49 + 603 + 8 + 1 + 3 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 102272769 + 147331044 = 10113^2 + 12138^2 .

It is not a de Polignac number, because 249603813 - 2⁹ = 249603301 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249603833) 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, 75981 + ... + 79197.

It is an arithmetic number, because the mean of its divisors is an integer number (15499497).

Almost surely, 2^249603813 is an apocalyptic number.

It is an amenable number.

249603813 is a deficient number, since it is larger than the sum of its proper divisors (122384115).

249603813 is a wasteful number, since it uses less digits than its factorization.

249603813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493 (or 3490 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 249603813 is about 15798.8548002695. The cubic root of 249603813 is about 629.6275727764.

The spelling of 249603813 in words is "two hundred forty-nine million, six hundred three thousand, eight hundred thirteen".