31920271 has 8 divisors (see below), whose sum is σ = 34963920. Its totient is φ = 29006208.

The previous prime is 31920269. The next prime is 31920293. The reversal of 31920271 is 17202913.

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

It is a cyclic number.

It is not a de Polignac number, because 31920271 - 2¹ = 31920269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31920211) 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 7 ways as a sum of consecutive naturals, for example, 31881 + ... + 32866.

It is an arithmetic number, because the mean of its divisors is an integer number (4370490).

Almost surely, 2^31920271 is an apocalyptic number.

31920271 is a deficient number, since it is larger than the sum of its proper divisors (3043649).

31920271 is a wasteful number, since it uses less digits than its factorization.

31920271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64793.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 31920271 is about 5649.8027399193. The cubic root of 31920271 is about 317.2163204870.

The spelling of 31920271 in words is "thirty-one million, nine hundred twenty thousand, two hundred seventy-one".