78831290431 has 2 divisors, whose sum is σ = 78831290432. Its totient is φ = 78831290430.

The previous prime is 78831290413. The next prime is 78831290437. The reversal of 78831290431 is 13409213887.

Together with previous prime (78831290413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13409213887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78831290431 - 2⁹ = 78831289919 is a prime.

It is a super-2 number, since 2×78831290431² (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 (78831290437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39415645215 + 39415645216.

It is an arithmetic number, because the mean of its divisors is an integer number (39415645216).

Almost surely, 2^78831290431 is an apocalyptic number.

78831290431 is a deficient number, since it is larger than the sum of its proper divisors (1).

78831290431 is an equidigital number, since it uses as much as digits as its factorization.

78831290431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 78831290431 in words is "seventy-eight billion, eight hundred thirty-one million, two hundred ninety thousand, four hundred thirty-one".