111661141 has 2 divisors, whose sum is σ = 111661142. Its totient is φ = 111661140.

The previous prime is 111661139. The next prime is 111661181. The reversal of 111661141 is 141166111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106688241 + 4972900 = 10329^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 111661141 - 2¹ = 111661139 is a prime.

Together with 111661139, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111661111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55830570 + 55830571.

It is an arithmetic number, because the mean of its divisors is an integer number (55830571).

Almost surely, 2^111661141 is an apocalyptic number.

It is an amenable number.

111661141 is a deficient number, since it is larger than the sum of its proper divisors (1).

111661141 is an equidigital number, since it uses as much as digits as its factorization.

111661141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 22.

The square root of 111661141 is about 10566.9835336296. The cubic root of 111661141 is about 481.5418317444.

The spelling of 111661141 in words is "one hundred eleven million, six hundred sixty-one thousand, one hundred forty-one".