78819598531 has 2 divisors, whose sum is σ = 78819598532. Its totient is φ = 78819598530.

The previous prime is 78819598519. The next prime is 78819598579. The reversal of 78819598531 is 13589591887.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (13589591887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78819598531 - 2¹⁵ = 78819565763 is a prime.

It is a super-2 number, since 2×78819598531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78819598931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39409799265 + 39409799266.

It is an arithmetic number, because the mean of its divisors is an integer number (39409799266).

Almost surely, 2^78819598531 is an apocalyptic number.

78819598531 is a deficient number, since it is larger than the sum of its proper divisors (1).

78819598531 is an equidigital number, since it uses as much as digits as its factorization.

78819598531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21772800, while the sum is 64.

The spelling of 78819598531 in words is "seventy-eight billion, eight hundred nineteen million, five hundred ninety-eight thousand, five hundred thirty-one".