31143243 has 4 divisors (see below), whose sum is σ = 41524328. Its totient is φ = 20762160.

The previous prime is 31143241. The next prime is 31143257. The reversal of 31143243 is 34234113.

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

It is not a de Polignac number, because 31143243 - 2¹ = 31143241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31143241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5190538 + ... + 5190543.

It is an arithmetic number, because the mean of its divisors is an integer number (10381082).

Almost surely, 2^31143243 is an apocalyptic number.

31143243 is a deficient number, since it is larger than the sum of its proper divisors (10381085).

31143243 is a wasteful number, since it uses less digits than its factorization.

31143243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10381084.

The product of its digits is 864, while the sum is 21.

The square root of 31143243 is about 5580.6131383568. The cubic root of 31143243 is about 314.6211722078.

Adding to 31143243 its reverse (34234113), we get a palindrome (65377356).

The spelling of 31143243 in words is "thirty-one million, one hundred forty-three thousand, two hundred forty-three".