813117501 has 32 divisors (see below), whose sum is σ = 1379308800. Its totient is φ = 463760640.

The previous prime is 813117499. The next prime is 813117563. The reversal of 813117501 is 105711318.

813117501 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 813117501 - 2¹ = 813117499 is a prime.

It is a super-2 number, since 2×813117501² = 1322320140864970002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813113501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103761 + ... + 111321.

It is an arithmetic number, because the mean of its divisors is an integer number (43103400).

Almost surely, 2^813117501 is an apocalyptic number.

It is an amenable number.

813117501 is a deficient number, since it is larger than the sum of its proper divisors (566191299).

813117501 is a wasteful number, since it uses less digits than its factorization.

813117501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8146 (or 8140 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 27.

The square root of 813117501 is about 28515.2152543164. The cubic root of 813117501 is about 933.3641220994.

Adding to 813117501 its reverse (105711318), we get a palindrome (918828819).

The spelling of 813117501 in words is "eight hundred thirteen million, one hundred seventeen thousand, five hundred one".