31343811 has 4 divisors (see below), whose sum is σ = 41791752. Its totient is φ = 20895872.

The previous prime is 31343797. The next prime is 31343833. The reversal of 31343811 is 11834313.

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 31343811 - 2⁶ = 31343747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31343891) 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 3 ways as a sum of consecutive naturals, for example, 5223966 + ... + 5223971.

It is an arithmetic number, because the mean of its divisors is an integer number (10447938).

Almost surely, 2^31343811 is an apocalyptic number.

31343811 is a deficient number, since it is larger than the sum of its proper divisors (10447941).

31343811 is a wasteful number, since it uses less digits than its factorization.

31343811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10447940.

The product of its digits is 864, while the sum is 24.

The square root of 31343811 is about 5598.5543669772. The cubic root of 31343811 is about 315.2951328180.

The spelling of 31343811 in words is "thirty-one million, three hundred forty-three thousand, eight hundred eleven".