111070721 has 2 divisors, whose sum is σ = 111070722. Its totient is φ = 111070720.

The previous prime is 111070699. The next prime is 111070727. The reversal of 111070721 is 127070111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90459121 + 20611600 = 9511^2 + 4540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111070721 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 111070693 and 111070702.

It is not a weakly prime, because it can be changed into another prime (111070727) 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 as a sum of consecutive naturals, namely, 55535360 + 55535361.

It is an arithmetic number, because the mean of its divisors is an integer number (55535361).

Almost surely, 2^111070721 is an apocalyptic number.

It is an amenable number.

111070721 is a deficient number, since it is larger than the sum of its proper divisors (1).

111070721 is an equidigital number, since it uses as much as digits as its factorization.

111070721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 111070721 is about 10539.0094885620. The cubic root of 111070721 is about 480.6915970888.

The spelling of 111070721 in words is "one hundred eleven million, seventy thousand, seven hundred twenty-one".