31689554 has 8 divisors (see below), whose sum is σ = 51190860. Its totient is φ = 14625936.

The previous prime is 31689529. The next prime is 31689563. The reversal of 31689554 is 45598613.

It can be written as a sum of positive squares in 2 ways, for example, as 31416025 + 273529 = 5605^2 + 523^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 609389 + ... + 609440.

Almost surely, 2^31689554 is an apocalyptic number.

31689554 is a deficient number, since it is larger than the sum of its proper divisors (19501306).

31689554 is a wasteful number, since it uses less digits than its factorization.

31689554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218844.

The product of its digits is 129600, while the sum is 41.

The square root of 31689554 is about 5629.3475643275. The cubic root of 31689554 is about 316.4502008471.

The spelling of 31689554 in words is "thirty-one million, six hundred eighty-nine thousand, five hundred fifty-four".