813203303 has 4 divisors (see below), whose sum is σ = 887130888. Its totient is φ = 739275720.

The previous prime is 813203299. The next prime is 813203309. The reversal of 813203303 is 303302318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 813203303 - 2² = 813203299 is a prime.

It is a super-2 number, since 2×813203303² = 1322599224020219618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813203309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36963776 + ... + 36963797.

It is an arithmetic number, because the mean of its divisors is an integer number (221782722).

Almost surely, 2^813203303 is an apocalyptic number.

813203303 is a deficient number, since it is larger than the sum of its proper divisors (73927585).

813203303 is a wasteful number, since it uses less digits than its factorization.

813203303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73927584.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 813203303 is about 28516.7197096721. The cubic root of 813203303 is about 933.3969511766.

The spelling of 813203303 in words is "eight hundred thirteen million, two hundred three thousand, three hundred three".