813193983 has 12 divisors (see below), whose sum is σ = 1342415568. Its totient is φ = 464682240.

The previous prime is 813193981. The next prime is 813194059. The reversal of 813193983 is 389391318.

It is a happy number.

It is not a de Polignac number, because 813193983 - 2¹ = 813193981 is a prime.

It is a super-2 number, since 2×813193983² = 1322568907974808578, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813193981) 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, 6453858 + ... + 6453983.

It is an arithmetic number, because the mean of its divisors is an integer number (111867964).

Almost surely, 2^813193983 is an apocalyptic number.

813193983 is a deficient number, since it is larger than the sum of its proper divisors (529221585).

813193983 is a wasteful number, since it uses less digits than its factorization.

813193983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12907854 (or 12907851 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 813193983 is about 28516.5562962992. The cubic root of 813193983 is about 933.3933853226.

The spelling of 813193983 in words is "eight hundred thirteen million, one hundred ninety-three thousand, nine hundred eighty-three".