31113143 has 4 divisors (see below), whose sum is σ = 32186040. Its totient is φ = 30040248.

The previous prime is 31113113. The next prime is 31113167. The reversal of 31113143 is 34131113.

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 31113143 - 2¹⁰ = 31112119 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 (31113113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536405 + ... + 536462.

It is an arithmetic number, because the mean of its divisors is an integer number (8046510).

Almost surely, 2^31113143 is an apocalyptic number.

31113143 is a deficient number, since it is larger than the sum of its proper divisors (1072897).

31113143 is a wasteful number, since it uses less digits than its factorization.

31113143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072896.

The product of its digits is 108, while the sum is 17.

The square root of 31113143 is about 5577.9156501331. The cubic root of 31113143 is about 314.5197788935.

Adding to 31113143 its reverse (34131113), we get a palindrome (65244256).

The spelling of 31113143 in words is "thirty-one million, one hundred thirteen thousand, one hundred forty-three".