111991141 has 2 divisors, whose sum is σ = 111991142. Its totient is φ = 111991140.

The previous prime is 111991133. The next prime is 111991147. The reversal of 111991141 is 141199111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98922916 + 13068225 = 9946^2 + 3615^2 .

It is a cyclic number.

It is not a de Polignac number, because 111991141 - 2³ = 111991133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111991147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55995570 + 55995571.

It is an arithmetic number, because the mean of its divisors is an integer number (55995571).

Almost surely, 2^111991141 is an apocalyptic number.

It is an amenable number.

111991141 is a deficient number, since it is larger than the sum of its proper divisors (1).

111991141 is an equidigital number, since it uses as much as digits as its factorization.

111991141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 28.

The square root of 111991141 is about 10582.5866875731. The cubic root of 111991141 is about 482.0157433033.

The spelling of 111991141 in words is "one hundred eleven million, nine hundred ninety-one thousand, one hundred forty-one".