31550689 has 9 divisors (see below), whose sum is σ = 32576761. Its totient is φ = 30556480.

The previous prime is 31550681. The next prime is 31550699. The reversal of 31550689 is 98605513.

The square root of 31550689 is 5617.

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

It can be written as a sum of positive squares in 4 ways, for example, as 6630625 + 24920064 = 2575^2 + 4992^2 .

It is not a de Polignac number, because 31550689 - 2³ = 31550681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31550681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 230229 + ... + 230365.

Almost surely, 2^31550689 is an apocalyptic number.

31550689 is the 5617-th square number.

31550689 is the 2809-th centered octagonal number.

It is an amenable number.

31550689 is a deficient number, since it is larger than the sum of its proper divisors (1026072).

31550689 is an frugal number, since it uses more digits than its factorization.

31550689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The cubic root of 31550689 is about 315.9872911889.

Multiplying 31550689 by its product of nonzero digits (32400), we get a square (1022242323600 = 1011060²).

The spelling of 31550689 in words is "thirty-one million, five hundred fifty thousand, six hundred eighty-nine".