78131083591 has 4 divisors (see below), whose sum is σ = 85233909384. Its totient is φ = 71028257800.

The previous prime is 78131083577. The next prime is 78131083619. The reversal of 78131083591 is 19538013187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78131083591 - 2¹¹ = 78131081543 is a prime.

It is a super-2 number, since 2×78131083591² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78131083571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551412880 + ... + 3551412901.

It is an arithmetic number, because the mean of its divisors is an integer number (21308477346).

Almost surely, 2^78131083591 is an apocalyptic number.

78131083591 is a deficient number, since it is larger than the sum of its proper divisors (7102825793).

78131083591 is a wasteful number, since it uses less digits than its factorization.

78131083591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7102825792.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 78131083591 in words is "seventy-eight billion, one hundred thirty-one million, eighty-three thousand, five hundred ninety-one".