111640321 has 8 divisors (see below), whose sum is σ = 125455680. Its totient is φ = 98571792.

The previous prime is 111640303. The next prime is 111640327. The reversal of 111640321 is 123046111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111640321 - 2¹⁷ = 111509249 is a prime.

It is a super-2 number, since 2×111640321² = 24927122545966082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111640327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186391 + ... + 186988.

It is an arithmetic number, because the mean of its divisors is an integer number (15681960).

Almost surely, 2^111640321 is an apocalyptic number.

It is an amenable number.

111640321 is a deficient number, since it is larger than the sum of its proper divisors (13815359).

111640321 is a wasteful number, since it uses less digits than its factorization.

111640321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373415.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 111640321 is about 10565.9983437440. The cubic root of 111640321 is about 481.5119009375.

Adding to 111640321 its reverse (123046111), we get a palindrome (234686432).

The spelling of 111640321 in words is "one hundred eleven million, six hundred forty thousand, three hundred twenty-one".