111400721 has 2 divisors, whose sum is σ = 111400722. Its totient is φ = 111400720.

The previous prime is 111400693. The next prime is 111400733. The reversal of 111400721 is 127004111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93219025 + 18181696 = 9655^2 + 4264^2 .

It is a cyclic number.

It is not a de Polignac number, because 111400721 - 2⁶ = 111400657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111400721.

It is not a weakly prime, because it can be changed into another prime (111400771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55700360 + 55700361.

It is an arithmetic number, because the mean of its divisors is an integer number (55700361).

Almost surely, 2^111400721 is an apocalyptic number.

It is an amenable number.

111400721 is a deficient number, since it is larger than the sum of its proper divisors (1).

111400721 is an equidigital number, since it uses as much as digits as its factorization.

111400721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 111400721 is about 10554.6539971711. The cubic root of 111400721 is about 481.1671841303.

Adding to 111400721 its reverse (127004111), we get a palindrome (238404832).

The spelling of 111400721 in words is "one hundred eleven million, four hundred thousand, seven hundred twenty-one".