111139621 has 8 divisors (see below), whose sum is σ = 113155704. Its totient is φ = 109129920.

The previous prime is 111139603. The next prime is 111139627. The reversal of 111139621 is 126931111.

It can be written as a sum of positive squares in 4 ways, for example, as 12852225 + 98287396 = 3585^2 + 9914^2 .

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 111139621 - 2⁹ = 111139109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111139627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45975 + ... + 48331.

It is an arithmetic number, because the mean of its divisors is an integer number (14144463).

Almost surely, 2^111139621 is an apocalyptic number.

It is an amenable number.

111139621 is a deficient number, since it is larger than the sum of its proper divisors (2016083).

111139621 is an equidigital number, since it uses as much as digits as its factorization.

111139621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191.

The product of its digits is 324, while the sum is 25.

The square root of 111139621 is about 10542.2777899276. The cubic root of 111139621 is about 480.7909716278.

The spelling of 111139621 in words is "one hundred eleven million, one hundred thirty-nine thousand, six hundred twenty-one".