31920093 has 6 divisors (see below), whose sum is σ = 46106814. Its totient is φ = 21280056.

The previous prime is 31920071. The next prime is 31920137. The reversal of 31920093 is 39002913.

It can be written as a sum of positive squares in only one way, i.e., 28164249 + 3755844 = 5307^2 + 1938^2 .

It is not a de Polignac number, because 31920093 - 2¹⁴ = 31903709 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31920013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1773330 + ... + 1773347.

It is an arithmetic number, because the mean of its divisors is an integer number (7684469).

Almost surely, 2^31920093 is an apocalyptic number.

It is an amenable number.

31920093 is a deficient number, since it is larger than the sum of its proper divisors (14186721).

31920093 is a wasteful number, since it uses less digits than its factorization.

31920093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3546683 (or 3546680 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 31920093 is about 5649.7869871350. The cubic root of 31920093 is about 317.2157308449.

The spelling of 31920093 in words is "thirty-one million, nine hundred twenty thousand, ninety-three".