813121063 has 8 divisors (see below), whose sum is σ = 818542400. Its totient is φ = 807716448.

The previous prime is 813120983. The next prime is 813121069. The reversal of 813121063 is 360121318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 813121063 - 2²⁵ = 779566631 is a prime.

It is a super-2 number, since 2×813121063² = 1322331726188499938, 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 (813121069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102193 + ... + 109861.

It is an arithmetic number, because the mean of its divisors is an integer number (102317800).

Almost surely, 2^813121063 is an apocalyptic number.

813121063 is a deficient number, since it is larger than the sum of its proper divisors (5421337).

813121063 is a wasteful number, since it uses less digits than its factorization.

813121063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8361.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 813121063 is about 28515.2777121318. The cubic root of 813121063 is about 933.3654850177.

The spelling of 813121063 in words is "eight hundred thirteen million, one hundred twenty-one thousand, sixty-three".