31143293 has 4 divisors (see below), whose sum is σ = 31155168. Its totient is φ = 31131420.

The previous prime is 31143271. The next prime is 31143317. The reversal of 31143293 is 39234113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31143293 - 2²⁰ = 30094717 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 (31143193) 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 3 ways as a sum of consecutive naturals, for example, 71 + ... + 7892.

It is an arithmetic number, because the mean of its divisors is an integer number (7788792).

Almost surely, 2^31143293 is an apocalyptic number.

It is an amenable number.

31143293 is a deficient number, since it is larger than the sum of its proper divisors (11875).

31143293 is an equidigital number, since it uses as much as digits as its factorization.

31143293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11874.

The product of its digits is 1944, while the sum is 26.

The square root of 31143293 is about 5580.6176181494. The cubic root of 31143293 is about 314.6213405808.

The spelling of 31143293 in words is "thirty-one million, one hundred forty-three thousand, two hundred ninety-three".