77391315231 has 8 divisors (see below), whose sum is σ = 103197189504. Its totient is φ = 51589825560.

The previous prime is 77391315227. The next prime is 77391315251. The reversal of 77391315231 is 13251319377.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77391315231 - 2² = 77391315227 is a prime.

It is a super-2 number, since 2×77391315231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77391315251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1054741 + ... + 1125726.

It is an arithmetic number, because the mean of its divisors is an integer number (12899648688).

Almost surely, 2^77391315231 is an apocalyptic number.

77391315231 is a deficient number, since it is larger than the sum of its proper divisors (25805874273).

77391315231 is a wasteful number, since it uses less digits than its factorization.

77391315231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192301.

The product of its digits is 119070, while the sum is 42.

The spelling of 77391315231 in words is "seventy-seven billion, three hundred ninety-one million, three hundred fifteen thousand, two hundred thirty-one".