111531321 has 12 divisors (see below), whose sum is σ = 175746480. Its totient is φ = 67594680.

The previous prime is 111531317. The next prime is 111531323. The reversal of 111531321 is 123135111.

111531321 is a `hidden beast` number, since 111 + 531 + 3 + 21 = 666.

It is not a de Polignac number, because 111531321 - 2² = 111531317 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111531294 and 111531303.

It is not an unprimeable number, because it can be changed into a prime (111531323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 563191 + ... + 563388.

It is an arithmetic number, because the mean of its divisors is an integer number (14645540).

Almost surely, 2^111531321 is an apocalyptic number.

111531321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111531321 is a deficient number, since it is larger than the sum of its proper divisors (64215159).

111531321 is a wasteful number, since it uses less digits than its factorization.

111531321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126596 (or 1126593 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 111531321 is about 10560.8390291681. The cubic root of 111531321 is about 481.3551419005.

Adding to 111531321 its reverse (123135111), we get a palindrome (234666432).

The spelling of 111531321 in words is "one hundred eleven million, five hundred thirty-one thousand, three hundred twenty-one".