111000721 has 6 divisors (see below), whose sum is σ = 120196230. Its totient is φ = 102462048.

The previous prime is 111000707. The next prime is 111000733. The reversal of 111000721 is 127000111.

It can be written as a sum of positive squares in 3 ways, for example, as 6225025 + 104775696 = 2495^2 + 10236^2 .

It is not a de Polignac number, because 111000721 - 2¹³ = 110992529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111000751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 328236 + ... + 328573.

It is an arithmetic number, because the mean of its divisors is an integer number (20032705).

Almost surely, 2^111000721 is an apocalyptic number.

It is an amenable number.

111000721 is a deficient number, since it is larger than the sum of its proper divisors (9195509).

111000721 is an equidigital number, since it uses as much as digits as its factorization.

111000721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656835 (or 656822 counting only the distinct ones).

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 111000721 is about 10535.6879699429. The cubic root of 111000721 is about 480.5905939240.

Adding to 111000721 its reverse (127000111), we get a palindrome (238000832).

The spelling of 111000721 in words is "one hundred eleven million, seven hundred twenty-one", and thus it is an aban number.