111959021 has 2 divisors, whose sum is σ = 111959022. Its totient is φ = 111959020.

The previous prime is 111959017. The next prime is 111959033. The reversal of 111959021 is 120959111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60621796 + 51337225 = 7786^2 + 7165^2 .

It is a cyclic number.

It is not a de Polignac number, because 111959021 - 2² = 111959017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111959041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55979510 + 55979511.

It is an arithmetic number, because the mean of its divisors is an integer number (55979511).

Almost surely, 2^111959021 is an apocalyptic number.

It is an amenable number.

111959021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111959021 is an equidigital number, since it uses as much as digits as its factorization.

111959021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 29.

The square root of 111959021 is about 10581.0689913638. The cubic root of 111959021 is about 481.9696568423.

The spelling of 111959021 in words is "one hundred eleven million, nine hundred fifty-nine thousand, twenty-one".