31871868011 has 2 divisors, whose sum is σ = 31871868012. Its totient is φ = 31871868010.

The previous prime is 31871867987. The next prime is 31871868037. The reversal of 31871868011 is 11086817813.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31871868011 is a prime.

It is a super-2 number, since 2×31871868011² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31871868071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15935934005 + 15935934006.

It is an arithmetic number, because the mean of its divisors is an integer number (15935934006).

Almost surely, 2^31871868011 is an apocalyptic number.

31871868011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31871868011 is an equidigital number, since it uses as much as digits as its factorization.

31871868011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 44.

The spelling of 31871868011 in words is "thirty-one billion, eight hundred seventy-one million, eight hundred sixty-eight thousand, eleven".