813404031 has 16 divisors (see below), whose sum is σ = 1203189120. Its totient is φ = 484615520.

The previous prime is 813404029. The next prime is 813404047. The reversal of 813404031 is 130404318.

It is a cyclic number.

It is not a de Polignac number, because 813404031 - 2¹ = 813404029 is a prime.

It is a super-2 number, since 2×813404031² = 1323252235294097922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 813403992 and 813404010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813444031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206940 + ... + 210833.

It is an arithmetic number, because the mean of its divisors is an integer number (75199320).

Almost surely, 2^813404031 is an apocalyptic number.

813404031 is a deficient number, since it is larger than the sum of its proper divisors (389785089).

813404031 is a wasteful number, since it uses less digits than its factorization.

813404031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417846.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 813404031 is about 28520.2389716496. The cubic root of 813404031 is about 933.4737435724.

Adding to 813404031 its reverse (130404318), we get a palindrome (943808349).

The spelling of 813404031 in words is "eight hundred thirteen million, four hundred four thousand, thirty-one".