31107486779 has 4 divisors (see below), whose sum is σ = 31194137520. Its totient is φ = 31020836040.

The previous prime is 31107486763. The next prime is 31107486797. The reversal of 31107486779 is 97768470113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97768470113 = 157 ⋅622729109.

It is a cyclic number.

It is not a de Polignac number, because 31107486779 - 2⁴ = 31107486763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31107486779.

It is not an unprimeable number, because it can be changed into a prime (31107486799) 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, 43324832 + ... + 43325549.

It is an arithmetic number, because the mean of its divisors is an integer number (7798534380).

Almost surely, 2^31107486779 is an apocalyptic number.

31107486779 is a deficient number, since it is larger than the sum of its proper divisors (86650741).

31107486779 is an equidigital number, since it uses as much as digits as its factorization.

31107486779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86650740.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The spelling of 31107486779 in words is "thirty-one billion, one hundred seven million, four hundred eighty-six thousand, seven hundred seventy-nine".