820391039112131 has 2 divisors, whose sum is σ = 820391039112132. Its totient is φ = 820391039112130.

The previous prime is 820391039112121. The next prime is 820391039112277. The reversal of 820391039112131 is 131211930193028.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820391039112131 is a prime.

It is a super-2 number, since 2×820391039112131² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (820391039112121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410195519556065 + 410195519556066.

It is an arithmetic number, because the mean of its divisors is an integer number (410195519556066).

Almost surely, 2^{820391039112131} is an apocalyptic number.

820391039112131 is a deficient number, since it is larger than the sum of its proper divisors (1).

820391039112131 is an equidigital number, since it uses as much as digits as its factorization.

820391039112131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 820391039112131 in words is "eight hundred twenty trillion, three hundred ninety-one billion, thirty-nine million, one hundred twelve thousand, one hundred thirty-one".