78792831281 has 2 divisors, whose sum is σ = 78792831282. Its totient is φ = 78792831280.

The previous prime is 78792831263. The next prime is 78792831283. The reversal of 78792831281 is 18213829787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40761591025 + 38031240256 = 201895^2 + 195016^2 .

It is an emirp because it is prime and its reverse (18213829787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78792831281 - 2¹⁰ = 78792830257 is a prime.

It is a super-2 number, since 2×78792831281² (a number of 23 digits) contains 22 as substring.

Together with 78792831283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78792831283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39396415640 + 39396415641.

It is an arithmetic number, because the mean of its divisors is an integer number (39396415641).

Almost surely, 2^78792831281 is an apocalyptic number.

It is an amenable number.

78792831281 is a deficient number, since it is larger than the sum of its proper divisors (1).

78792831281 is an equidigital number, since it uses as much as digits as its factorization.

78792831281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 56.

The spelling of 78792831281 in words is "seventy-eight billion, seven hundred ninety-two million, eight hundred thirty-one thousand, two hundred eighty-one".