813445031 has 6 divisors (see below), whose sum is σ = 946252440. Its totient is φ = 697238556.

The previous prime is 813444997. The next prime is 813445049. The reversal of 813445031 is 130544318.

It is a de Polignac number, because none of the positive numbers 2^k-813445031 is a prime.

It is a super-2 number, since 2×813445031² = 1323385636917181922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 813444985 and 813445003.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8300411 + ... + 8300508.

It is an arithmetic number, because the mean of its divisors is an integer number (157708740).

Almost surely, 2^813445031 is an apocalyptic number.

813445031 is a deficient number, since it is larger than the sum of its proper divisors (132807409).

813445031 is a wasteful number, since it uses less digits than its factorization.

813445031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16600933 (or 16600926 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 813445031 is about 28520.9577503982. The cubic root of 813445031 is about 933.4894273650.

Adding to 813445031 its reverse (130544318), we get a palindrome (943989349).

The spelling of 813445031 in words is "eight hundred thirteen million, four hundred forty-five thousand, thirty-one".