78538562831 has 2 divisors, whose sum is σ = 78538562832. Its totient is φ = 78538562830.

The previous prime is 78538562827. The next prime is 78538562863. The reversal of 78538562831 is 13826583587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78538562831 - 2² = 78538562827 is a prime.

It is a super-2 number, since 2×78538562831² (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 (78538562131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39269281415 + 39269281416.

It is an arithmetic number, because the mean of its divisors is an integer number (39269281416).

Almost surely, 2^78538562831 is an apocalyptic number.

78538562831 is a deficient number, since it is larger than the sum of its proper divisors (1).

78538562831 is an equidigital number, since it uses as much as digits as its factorization.

78538562831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9676800, while the sum is 56.

The spelling of 78538562831 in words is "seventy-eight billion, five hundred thirty-eight million, five hundred sixty-two thousand, eight hundred thirty-one".