31388732813 has 16 divisors (see below), whose sum is σ = 33186101760. Its totient is φ = 29639971200.

The previous prime is 31388732807. The next prime is 31388732831. The reversal of 31388732813 is 31823788313.

It is a cyclic number.

It is not a de Polignac number, because 31388732813 - 2¹⁰ = 31388731789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31388632813) 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 15 ways as a sum of consecutive naturals, for example, 2051873 + ... + 2067113.

It is an arithmetic number, because the mean of its divisors is an integer number (2074131360).

Almost surely, 2^31388732813 is an apocalyptic number.

It is an amenable number.

31388732813 is a deficient number, since it is larger than the sum of its proper divisors (1797368947).

31388732813 is a wasteful number, since it uses less digits than its factorization.

31388732813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16828.

The product of its digits is 580608, while the sum is 47.

The spelling of 31388732813 in words is "thirty-one billion, three hundred eighty-eight million, seven hundred thirty-two thousand, eight hundred thirteen".