111887869 has 4 divisors (see below), whose sum is σ = 111933180. Its totient is φ = 111842560.

The previous prime is 111887861. The next prime is 111887873. The reversal of 111887869 is 968788111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968788111 = 47 ⋅20612513.

It can be written as a sum of positive squares in 2 ways, for example, as 67864644 + 44023225 = 8238^2 + 6635^2 .

It is a cyclic number.

It is not a de Polignac number, because 111887869 - 2³ = 111887861 is a prime.

It is a super-2 number, since 2×111887869² = 25037790458722322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111887861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18724 + ... + 23965.

It is an arithmetic number, because the mean of its divisors is an integer number (27983295).

Almost surely, 2^111887869 is an apocalyptic number.

It is an amenable number.

111887869 is a deficient number, since it is larger than the sum of its proper divisors (45311).

111887869 is an equidigital number, since it uses as much as digits as its factorization.

111887869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45310.

The product of its digits is 193536, while the sum is 49.

The square root of 111887869 is about 10577.7062258318. The cubic root of 111887869 is about 481.8675350364.

The spelling of 111887869 in words is "one hundred eleven million, eight hundred eighty-seven thousand, eight hundred sixty-nine".