111785231 has 2 divisors, whose sum is σ = 111785232. Its totient is φ = 111785230.

The previous prime is 111785213. The next prime is 111785243. The reversal of 111785231 is 132587111.

Together with previous prime (111785213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111785231 is a prime.

It is a super-2 number, since 2×111785231² = 24991875739446722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111785194 and 111785203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111785281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55892615 + 55892616.

It is an arithmetic number, because the mean of its divisors is an integer number (55892616).

Almost surely, 2^111785231 is an apocalyptic number.

111785231 is a deficient number, since it is larger than the sum of its proper divisors (1).

111785231 is an equidigital number, since it uses as much as digits as its factorization.

111785231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 29.

The square root of 111785231 is about 10572.8534937357. The cubic root of 111785231 is about 481.7201462525.

The spelling of 111785231 in words is "one hundred eleven million, seven hundred eighty-five thousand, two hundred thirty-one".