78103491831 has 24 divisors (see below), whose sum is σ = 114407089056. Its totient is φ = 51335285760.

The previous prime is 78103491827. The next prime is 78103491871. The reversal of 78103491831 is 13819430187.

78103491831 is a `hidden beast` number, since 7 + 81 + 0 + 3 + 491 + 83 + 1 = 666.

It is not a de Polignac number, because 78103491831 - 2² = 78103491827 is a prime.

It is a super-2 number, since 2×78103491831² (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 (78103491821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1727271 + ... + 1771911.

It is an arithmetic number, because the mean of its divisors is an integer number (4766962044).

Almost surely, 2^78103491831 is an apocalyptic number.

78103491831 is a deficient number, since it is larger than the sum of its proper divisors (36303597225).

78103491831 is a wasteful number, since it uses less digits than its factorization.

78103491831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47383 (or 47380 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 78103491831 in words is "seventy-eight billion, one hundred three million, four hundred ninety-one thousand, eight hundred thirty-one".