111661140 has 24 divisors (see below), whose sum is σ = 312651360. Its totient is φ = 29776288.

The previous prime is 111661139. The next prime is 111661141. The reversal of 111661140 is 41166111.

It is an interprime number because it is at equal distance from previous prime (111661139) and next prime (111661141).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111661141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930450 + ... + 930569.

It is an arithmetic number, because the mean of its divisors is an integer number (13027140).

Almost surely, 2^111661140 is an apocalyptic number.

111661140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111661140 is an abundant number, since it is smaller than the sum of its proper divisors (200990220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111661140 is a wasteful number, since it uses less digits than its factorization.

111661140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861031 (or 1861029 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 111661140 is about 10566.9834863124. The cubic root of 111661140 is about 481.5418303069.

The spelling of 111661140 in words is "one hundred eleven million, six hundred sixty-one thousand, one hundred forty".