823031000091 has 8 divisors (see below), whose sum is σ = 1219305185360. Its totient is φ = 548687333376.

The previous prime is 823031000081. The next prime is 823031000101. The reversal of 823031000091 is 190000130328.

It is an interprime number because it is at equal distance from previous prime (823031000081) and next prime (823031000101).

It is not a de Polignac number, because 823031000091 - 2¹⁹ = 823030475803 is a prime.

It is a super-2 number, since 2×823031000091² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 30482629633 = 823031000091 / (8 + 2 + 3 + 0 + 3 + 1 + 0 + 0 + 0 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823031000081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15241314790 + ... + 15241314843.

It is an arithmetic number, because the mean of its divisors is an integer number (152413148170).

Almost surely, 2^823031000091 is an apocalyptic number.

823031000091 is a deficient number, since it is larger than the sum of its proper divisors (396274185269).

823031000091 is a wasteful number, since it uses less digits than its factorization.

823031000091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30482629642 (or 30482629636 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The spelling of 823031000091 in words is "eight hundred twenty-three billion, thirty-one million, ninety-one", and thus it is an aban number.