31143393 has 8 divisors (see below), whose sum is σ = 46138400. Its totient is φ = 20762244.

The previous prime is 31143391. The next prime is 31143407. The reversal of 31143393 is 39334113.

It is not a de Polignac number, because 31143393 - 2¹ = 31143391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1153459 = 31143393 / (3 + 1 + 1 + 4 + 3 + 3 + 9 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31143391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576703 + ... + 576756.

It is an arithmetic number, because the mean of its divisors is an integer number (5767300).

Almost surely, 2^31143393 is an apocalyptic number.

It is an amenable number.

31143393 is a deficient number, since it is larger than the sum of its proper divisors (14995007).

31143393 is a wasteful number, since it uses less digits than its factorization.

31143393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153468 (or 1153462 counting only the distinct ones).

The product of its digits is 2916, while the sum is 27.

The square root of 31143393 is about 5580.6265777240. The cubic root of 31143393 is about 314.6216773264.

The spelling of 31143393 in words is "thirty-one million, one hundred forty-three thousand, three hundred ninety-three".