111891124831 has 2 divisors, whose sum is σ = 111891124832. Its totient is φ = 111891124830.

The previous prime is 111891124781. The next prime is 111891124859. The reversal of 111891124831 is 138421198111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111891124831 - 2¹³ = 111891116639 is a prime.

It is a super-2 number, since 2×111891124831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111891124031) 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 as a sum of consecutive naturals, namely, 55945562415 + 55945562416.

It is an arithmetic number, because the mean of its divisors is an integer number (55945562416).

Almost surely, 2^111891124831 is an apocalyptic number.

111891124831 is a deficient number, since it is larger than the sum of its proper divisors (1).

111891124831 is an equidigital number, since it uses as much as digits as its factorization.

111891124831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 40.

The spelling of 111891124831 in words is "one hundred eleven billion, eight hundred ninety-one million, one hundred twenty-four thousand, eight hundred thirty-one".