111998231 has 2 divisors, whose sum is σ = 111998232. Its totient is φ = 111998230.

The previous prime is 111998219. The next prime is 111998251. The reversal of 111998231 is 132899111.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111998231 is a prime.

It is a super-2 number, since 2×111998231² = 25087207494258722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 111998191 and 111998200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111998251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55999115 + 55999116.

It is an arithmetic number, because the mean of its divisors is an integer number (55999116).

Almost surely, 2^111998231 is an apocalyptic number.

111998231 is a deficient number, since it is larger than the sum of its proper divisors (1).

111998231 is an equidigital number, since it uses as much as digits as its factorization.

111998231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 35.

The square root of 111998231 is about 10582.9216665342. The cubic root of 111998231 is about 482.0259149993.

The spelling of 111998231 in words is "one hundred eleven million, nine hundred ninety-eight thousand, two hundred thirty-one".