78809709031 has 2 divisors, whose sum is σ = 78809709032. Its totient is φ = 78809709030.

The previous prime is 78809709007. The next prime is 78809709067. The reversal of 78809709031 is 13090790887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78809709031 - 2¹⁵ = 78809676263 is a prime.

It is a super-2 number, since 2×78809709031² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78809709031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78809709331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39404854515 + 39404854516.

It is an arithmetic number, because the mean of its divisors is an integer number (39404854516).

Almost surely, 2^78809709031 is an apocalyptic number.

78809709031 is a deficient number, since it is larger than the sum of its proper divisors (1).

78809709031 is an equidigital number, since it uses as much as digits as its factorization.

78809709031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 78809709031 in words is "seventy-eight billion, eight hundred nine million, seven hundred nine thousand, thirty-one".