111551321 has 8 divisors (see below), whose sum is σ = 127680960. Its totient is φ = 95470128.

The previous prime is 111551309. The next prime is 111551327. The reversal of 111551321 is 123155111.

It is a happy number.

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 111551321 - 2¹⁴ = 111534937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111551293 and 111551302.

It is not an unprimeable number, because it can be changed into a prime (111551327) 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, 7031 + ... + 16508.

It is an arithmetic number, because the mean of its divisors is an integer number (15960120).

Almost surely, 2^111551321 is an apocalyptic number.

It is an amenable number.

111551321 is a deficient number, since it is larger than the sum of its proper divisors (16129639).

111551321 is an equidigital number, since it uses as much as digits as its factorization.

111551321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24223.

The product of its digits is 150, while the sum is 20.

The square root of 111551321 is about 10561.7858811851. The cubic root of 111551321 is about 481.3839126750.

The spelling of 111551321 in words is "one hundred eleven million, five hundred fifty-one thousand, three hundred twenty-one".