111887381 has 4 divisors (see below), whose sum is σ = 112768512. Its totient is φ = 111006252.

The previous prime is 111887323. The next prime is 111887393. The reversal of 111887381 is 183788111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111887381 - 2¹⁸ = 111625237 is a prime.

It is a super-2 number, since 2×111887381² = 25037572054078322, 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 (111887981) 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, 440375 + ... + 440628.

It is an arithmetic number, because the mean of its divisors is an integer number (28192128).

Almost surely, 2^111887381 is an apocalyptic number.

It is an amenable number.

111887381 is a deficient number, since it is larger than the sum of its proper divisors (881131).

111887381 is an equidigital number, since it uses as much as digits as its factorization.

111887381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881130.

The product of its digits is 10752, while the sum is 38.

The square root of 111887381 is about 10577.6831584237. The cubic root of 111887381 is about 481.8668344788.

The spelling of 111887381 in words is "one hundred eleven million, eight hundred eighty-seven thousand, three hundred eighty-one".