249773813 has 4 divisors (see below), whose sum is σ = 260633568. Its totient is φ = 238914060.

The previous prime is 249773779. The next prime is 249773837. The reversal of 249773813 is 318377942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249773813 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 (269773813) 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, 5429843 + ... + 5429888.

It is an arithmetic number, because the mean of its divisors is an integer number (65158392).

Almost surely, 2^249773813 is an apocalyptic number.

249773813 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

249773813 is a deficient number, since it is larger than the sum of its proper divisors (10859755).

249773813 is a wasteful number, since it uses less digits than its factorization.

249773813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10859754.

The product of its digits is 254016, while the sum is 44.

The square root of 249773813 is about 15804.2340212995. The cubic root of 249773813 is about 629.7704824474.

The spelling of 249773813 in words is "two hundred forty-nine million, seven hundred seventy-three thousand, eight hundred thirteen".