111640391 has 4 divisors (see below), whose sum is σ = 111718992. Its totient is φ = 111561792.

The previous prime is 111640379. The next prime is 111640423. The reversal of 111640391 is 193046111.

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

It is a cyclic number.

It is not a de Polignac number, because 111640391 - 2⁶ = 111640327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111640391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111640591) 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, 37130 + ... + 40023.

It is an arithmetic number, because the mean of its divisors is an integer number (27929748).

Almost surely, 2^111640391 is an apocalyptic number.

111640391 is a deficient number, since it is larger than the sum of its proper divisors (78601).

111640391 is an equidigital number, since it uses as much as digits as its factorization.

111640391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78600.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 111640391 is about 10566.0016562558. The cubic root of 111640391 is about 481.5120015757.

The spelling of 111640391 in words is "one hundred eleven million, six hundred forty thousand, three hundred ninety-one".