31143291 has 4 divisors (see below), whose sum is σ = 41524392. Its totient is φ = 20762192.

The previous prime is 31143271. The next prime is 31143317. The reversal of 31143291 is 19234113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31143291 - 2⁹ = 31142779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31143241) 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, 5190546 + ... + 5190551.

It is an arithmetic number, because the mean of its divisors is an integer number (10381098).

Almost surely, 2^31143291 is an apocalyptic number.

31143291 is a deficient number, since it is larger than the sum of its proper divisors (10381101).

31143291 is a wasteful number, since it uses less digits than its factorization.

31143291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10381100.

The product of its digits is 648, while the sum is 24.

The square root of 31143291 is about 5580.6174389578. The cubic root of 31143291 is about 314.6213338459.

The spelling of 31143291 in words is "thirty-one million, one hundred forty-three thousand, two hundred ninety-one".