111541321 has 2 divisors, whose sum is σ = 111541322. Its totient is φ = 111541320.

The previous prime is 111541319. The next prime is 111541327. The reversal of 111541321 is 123145111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107931321 + 3610000 = 10389^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 111541321 - 2¹ = 111541319 is a prime.

Together with 111541319, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111541327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55770660 + 55770661.

It is an arithmetic number, because the mean of its divisors is an integer number (55770661).

Almost surely, 2^111541321 is an apocalyptic number.

It is an amenable number.

111541321 is a deficient number, since it is larger than the sum of its proper divisors (1).

111541321 is an equidigital number, since it uses as much as digits as its factorization.

111541321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 19.

The square root of 111541321 is about 10561.3124657876. The cubic root of 111541321 is about 481.3695277176.

Adding to 111541321 its reverse (123145111), we get a palindrome (234686432).

It can be divided in two parts, 1115 and 41321, that added together give a square (42436 = 206²).

The spelling of 111541321 in words is "one hundred eleven million, five hundred forty-one thousand, three hundred twenty-one".