31730689 has 9 divisors (see below), whose sum is σ = 32735649. Its totient is φ = 30756180.

The previous prime is 31730683. The next prime is 31730693. The reversal of 31730689 is 98603713.

The square root of 31730689 is 5633.

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

It is not a de Polignac number, because 31730689 - 2⁷ = 31730561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31730683) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 242154 + ... + 242284.

Almost surely, 2^31730689 is an apocalyptic number.

31730689 is the 5633-rd square number.

31730689 is the 2817-th centered octagonal number.

It is an amenable number.

31730689 is a deficient number, since it is larger than the sum of its proper divisors (1004960).

31730689 is an frugal number, since it uses more digits than its factorization.

31730689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The cubic root of 31730689 is about 316.5870656186.

The spelling of 31730689 in words is "thirty-one million, seven hundred thirty thousand, six hundred eighty-nine".