111299621 has 2 divisors, whose sum is σ = 111299622. Its totient is φ = 111299620.

The previous prime is 111299611. The next prime is 111299627. The reversal of 111299621 is 126992111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67010596 + 44289025 = 8186^2 + 6655^2 .

It is a cyclic number.

It is not a de Polignac number, because 111299621 - 2¹⁸ = 111037477 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111299627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55649810 + 55649811.

It is an arithmetic number, because the mean of its divisors is an integer number (55649811).

Almost surely, 2^111299621 is an apocalyptic number.

It is an amenable number.

111299621 is a deficient number, since it is larger than the sum of its proper divisors (1).

111299621 is an equidigital number, since it uses as much as digits as its factorization.

111299621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 32.

The square root of 111299621 is about 10549.8635536200. The cubic root of 111299621 is about 481.0215814649.

The spelling of 111299621 in words is "one hundred eleven million, two hundred ninety-nine thousand, six hundred twenty-one".