31547798689 has 27 divisors (see below), whose sum is σ = 35348462163. Its totient is φ = 28134532800.

The previous prime is 31547798687. The next prime is 31547798713. The reversal of 31547798689 is 98689774513.

The square root of 31547798689 is 177617.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 23726165089 + 7821633600 = 154033^2 + 88440^2 .

It is not a de Polignac number, because 31547798689 - 2¹ = 31547798687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31547798687) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 130903609 + ... + 130903849.

Almost surely, 2^31547798689 is an apocalyptic number.

31547798689 is the 177617-th square number.

31547798689 is the 88809-th centered octagonal number.

It is an amenable number.

31547798689 is a deficient number, since it is larger than the sum of its proper divisors (3800663474).

31547798689 is an frugal number, since it uses more digits than its factorization.

31547798689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 319 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 67.

The spelling of 31547798689 in words is "thirty-one billion, five hundred forty-seven million, seven hundred ninety-eight thousand, six hundred eighty-nine".