31127993 has 8 divisors (see below), whose sum is σ = 34980288. Its totient is φ = 27483984.

The previous prime is 31127983. The next prime is 31128011. The reversal of 31127993 is 39972113.

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 31127993 - 2⁴ = 31127977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31127903) 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 7 ways as a sum of consecutive naturals, for example, 51755 + ... + 52352.

It is an arithmetic number, because the mean of its divisors is an integer number (4372536).

Almost surely, 2^31127993 is an apocalyptic number.

It is an amenable number.

31127993 is a deficient number, since it is larger than the sum of its proper divisors (3852295).

31127993 is a wasteful number, since it uses less digits than its factorization.

31127993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104143.

The product of its digits is 10206, while the sum is 35.

The square root of 31127993 is about 5579.2466337311. The cubic root of 31127993 is about 314.5698100098.

The spelling of 31127993 in words is "thirty-one million, one hundred twenty-seven thousand, nine hundred ninety-three".