31120204243 has 4 divisors (see below), whose sum is σ = 31121920440. Its totient is φ = 31118488048.

The previous prime is 31120204229. The next prime is 31120204261. The reversal of 31120204243 is 34240202113.

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 31120204243 - 2⁹ = 31120203731 is a prime.

It is a super-2 number, since 2×31120204243² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31120204543) 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, 830605 + ... + 867262.

It is an arithmetic number, because the mean of its divisors is an integer number (7780480110).

Almost surely, 2^31120204243 is an apocalyptic number.

31120204243 is a deficient number, since it is larger than the sum of its proper divisors (1716197).

31120204243 is a wasteful number, since it uses less digits than its factorization.

31120204243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716196.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31120204243 its reverse (34240202113), we get a palindrome (65360406356).

The spelling of 31120204243 in words is "thirty-one billion, one hundred twenty million, two hundred four thousand, two hundred forty-three".