77315895031 has 2 divisors, whose sum is σ = 77315895032. Its totient is φ = 77315895030.

The previous prime is 77315894993. The next prime is 77315895037. The reversal of 77315895031 is 13059851377.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13059851377) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77315895031 is a prime.

It is a super-2 number, since 2×77315895031² (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 (77315895037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38657947515 + 38657947516.

It is an arithmetic number, because the mean of its divisors is an integer number (38657947516).

Almost surely, 2^77315895031 is an apocalyptic number.

77315895031 is a deficient number, since it is larger than the sum of its proper divisors (1).

77315895031 is an equidigital number, since it uses as much as digits as its factorization.

77315895031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 793800, while the sum is 49.

The spelling of 77315895031 in words is "seventy-seven billion, three hundred fifteen million, eight hundred ninety-five thousand, thirty-one".