31243188811 has 4 divisors (see below), whose sum is σ = 31380824232. Its totient is φ = 31105553392.

The previous prime is 31243188797. The next prime is 31243188869. The reversal of 31243188811 is 11888134213.

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 31243188811 - 2¹⁷ = 31243057739 is a prime.

It is a super-2 number, since 2×31243188811² (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 (31243188881) 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, 68817370 + ... + 68817823.

It is an arithmetic number, because the mean of its divisors is an integer number (7845206058).

Almost surely, 2^31243188811 is an apocalyptic number.

31243188811 is a deficient number, since it is larger than the sum of its proper divisors (137635421).

31243188811 is a wasteful number, since it uses less digits than its factorization.

31243188811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137635420.

The product of its digits is 36864, while the sum is 40.

The spelling of 31243188811 in words is "thirty-one billion, two hundred forty-three million, one hundred eighty-eight thousand, eight hundred eleven".