111643819 has 4 divisors (see below), whose sum is σ = 127592944. Its totient is φ = 95694696.

The previous prime is 111643789. The next prime is 111643849. The reversal of 111643819 is 918346111.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (111643789) and next prime (111643849).

It is a cyclic number.

It is not a de Polignac number, because 111643819 - 2⁷ = 111643691 is a prime.

It is a super-2 number, since 2×111643819² = 24928684641809522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111643849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7974552 + ... + 7974565.

It is an arithmetic number, because the mean of its divisors is an integer number (31898236).

Almost surely, 2^111643819 is an apocalyptic number.

111643819 is a deficient number, since it is larger than the sum of its proper divisors (15949125).

111643819 is an equidigital number, since it uses as much as digits as its factorization.

111643819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15949124.

The product of its digits is 5184, while the sum is 34.

The square root of 111643819 is about 10566.1638734216. The cubic root of 111643819 is about 481.5169299182.

The spelling of 111643819 in words is "one hundred eleven million, six hundred forty-three thousand, eight hundred nineteen".