2031547778789 has 8 divisors (see below), whose sum is σ = 2151092773080. Its totient is φ = 1912007471616.

The previous prime is 2031547778699. The next prime is 2031547778863. The reversal of 2031547778789 is 9878777451302.

It can be written as a sum of positive squares in 4 ways, for example, as 1599592562500 + 431955216289 = 1264750^2 + 657233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2031547778789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031547778189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259094 + ... + 2032295.

It is an arithmetic number, because the mean of its divisors is an integer number (268886596635).

Almost surely, 2^{2031547778789} is an apocalyptic number.

It is an amenable number.

2031547778789 is a deficient number, since it is larger than the sum of its proper divisors (119544994291).

2031547778789 is a wasteful number, since it uses less digits than its factorization.

2031547778789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343559.

The product of its (nonzero) digits is 165957120, while the sum is 68.

The spelling of 2031547778789 in words is "two trillion, thirty-one billion, five hundred forty-seven million, seven hundred seventy-eight thousand, seven hundred eighty-nine".