71121111931 has 2 divisors, whose sum is σ = 71121111932. Its totient is φ = 71121111930.

The previous prime is 71121111907. The next prime is 71121112061. The reversal of 71121111931 is 13911112117.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71121111931 - 2⁵ = 71121111899 is a prime.

It is a super-2 number, since 2×71121111931² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71121111931.

It is not a weakly prime, because it can be changed into another prime (71121111031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35560555965 + 35560555966.

It is an arithmetic number, because the mean of its divisors is an integer number (35560555966).

Almost surely, 2^71121111931 is an apocalyptic number.

71121111931 is a deficient number, since it is larger than the sum of its proper divisors (1).

71121111931 is an equidigital number, since it uses as much as digits as its factorization.

71121111931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 28.

The spelling of 71121111931 in words is "seventy-one billion, one hundred twenty-one million, one hundred eleven thousand, nine hundred thirty-one".