31031897243 has 4 divisors (see below), whose sum is σ = 31050056880. Its totient is φ = 31013737608.

The previous prime is 31031897213. The next prime is 31031897261. The reversal of 31031897243 is 34279813013.

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 31031897243 - 2⁶ = 31031897179 is a prime.

It is a super-2 number, since 2×31031897243² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31031897243.

It is not an unprimeable number, because it can be changed into a prime (31031897213) 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, 9077255 + ... + 9080672.

It is an arithmetic number, because the mean of its divisors is an integer number (7762514220).

Almost surely, 2^31031897243 is an apocalyptic number.

31031897243 is a deficient number, since it is larger than the sum of its proper divisors (18159637).

31031897243 is a wasteful number, since it uses less digits than its factorization.

31031897243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18159636.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 31031897243 in words is "thirty-one billion, thirty-one million, eight hundred ninety-seven thousand, two hundred forty-three".