78791081431 has 2 divisors, whose sum is σ = 78791081432. Its totient is φ = 78791081430.

The previous prime is 78791081407. The next prime is 78791081477. The reversal of 78791081431 is 13418019787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78791081431 - 2¹¹ = 78791079383 is a prime.

It is a super-2 number, since 2×78791081431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78791081491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39395540715 + 39395540716.

It is an arithmetic number, because the mean of its divisors is an integer number (39395540716).

Almost surely, 2^78791081431 is an apocalyptic number.

78791081431 is a deficient number, since it is larger than the sum of its proper divisors (1).

78791081431 is an equidigital number, since it uses as much as digits as its factorization.

78791081431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 78791081431 in words is "seventy-eight billion, seven hundred ninety-one million, eighty-one thousand, four hundred thirty-one".