31231406243 has 4 divisors (see below), whose sum is σ = 31344155280. Its totient is φ = 31118657208.

The previous prime is 31231406209. The next prime is 31231406281. The reversal of 31231406243 is 34260413213.

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 31231406243 - 2²⁰ = 31230357667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231406203) 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, 56374103 + ... + 56374656.

It is an arithmetic number, because the mean of its divisors is an integer number (7836038820).

Almost surely, 2^31231406243 is an apocalyptic number.

31231406243 is a deficient number, since it is larger than the sum of its proper divisors (112749037).

31231406243 is a wasteful number, since it uses less digits than its factorization.

31231406243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112749036.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 31231406243 its reverse (34260413213), we get a palindrome (65491819456).

The spelling of 31231406243 in words is "thirty-one billion, two hundred thirty-one million, four hundred six thousand, two hundred forty-three".