78297177131 has 2 divisors, whose sum is σ = 78297177132. Its totient is φ = 78297177130.

The previous prime is 78297177097. The next prime is 78297177143. The reversal of 78297177131 is 13177179287.

It is a strong prime.

It is an emirp because it is prime and its reverse (13177179287) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78297177131 is a prime.

It is a super-2 number, since 2×78297177131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78297177191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39148588565 + 39148588566.

It is an arithmetic number, because the mean of its divisors is an integer number (39148588566).

Almost surely, 2^78297177131 is an apocalyptic number.

78297177131 is a deficient number, since it is larger than the sum of its proper divisors (1).

78297177131 is an equidigital number, since it uses as much as digits as its factorization.

78297177131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1037232, while the sum is 53.

The spelling of 78297177131 in words is "seventy-eight billion, two hundred ninety-seven million, one hundred seventy-seven thousand, one hundred thirty-one".