111099381 has 16 divisors (see below), whose sum is σ = 156645888. Its totient is φ = 69926400.

The previous prime is 111099379. The next prime is 111099383. The reversal of 111099381 is 183990111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111099379) and next prime (111099383).

It is not a de Polignac number, because 111099381 - 2¹ = 111099379 is a prime.

It is a super-2 number, since 2×111099381² = 24686144917166322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111099383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10756 + ... + 18381.

It is an arithmetic number, because the mean of its divisors is an integer number (9790368).

Almost surely, 2^111099381 is an apocalyptic number.

It is an amenable number.

111099381 is a deficient number, since it is larger than the sum of its proper divisors (45546507).

111099381 is a wasteful number, since it uses less digits than its factorization.

111099381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29212.

The product of its (nonzero) digits is 1944, while the sum is 33.

The square root of 111099381 is about 10540.3691111839. The cubic root of 111099381 is about 480.7329384261.

The spelling of 111099381 in words is "one hundred eleven million, ninety-nine thousand, three hundred eighty-one".