31311393 has 8 divisors (see below), whose sum is σ = 42536448. Its totient is φ = 20480304.

The previous prime is 31311391. The next prime is 31311407. The reversal of 31311393 is 39311313.

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

It is not a de Polignac number, because 31311393 - 2¹ = 31311391 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31311391) 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, 98305 + ... + 98622.

It is an arithmetic number, because the mean of its divisors is an integer number (5317056).

Almost surely, 2^31311393 is an apocalyptic number.

It is an amenable number.

31311393 is a deficient number, since it is larger than the sum of its proper divisors (11225055).

31311393 is a wasteful number, since it uses less digits than its factorization.

31311393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196983.

The product of its digits is 729, while the sum is 24.

The square root of 31311393 is about 5595.6584063004. The cubic root of 31311393 is about 315.1863950996.

The spelling of 31311393 in words is "thirty-one million, three hundred eleven thousand, three hundred ninety-three".