31355138789 has 16 divisors (see below), whose sum is σ = 34229395200. Its totient is φ = 28547678016.

The previous prime is 31355138761. The next prime is 31355138813. The reversal of 31355138789 is 98783155313.

It is a de Polignac number, because none of the positive numbers 2^k-31355138789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31355138789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31355138989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1025282 + ... + 1055420.

It is an arithmetic number, because the mean of its divisors is an integer number (2139337200).

Almost surely, 2^31355138789 is an apocalyptic number.

It is an amenable number.

31355138789 is a deficient number, since it is larger than the sum of its proper divisors (2874256411).

31355138789 is a wasteful number, since it uses less digits than its factorization.

31355138789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31244.

The product of its digits is 2721600, while the sum is 53.

The spelling of 31355138789 in words is "thirty-one billion, three hundred fifty-five million, one hundred thirty-eight thousand, seven hundred eighty-nine".