111180661 has 2 divisors, whose sum is σ = 111180662. Its totient is φ = 111180660.

The previous prime is 111180637. The next prime is 111180683. The reversal of 111180661 is 166081111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103917636 + 7263025 = 10194^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 111180661 - 2⁹ = 111180149 is a prime.

It is a super-2 number, since 2×111180661² = 24722278760793842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111180611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55590330 + 55590331.

It is an arithmetic number, because the mean of its divisors is an integer number (55590331).

Almost surely, 2^111180661 is an apocalyptic number.

It is an amenable number.

111180661 is a deficient number, since it is larger than the sum of its proper divisors (1).

111180661 is an equidigital number, since it uses as much as digits as its factorization.

111180661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 111180661 is about 10544.2240586968. The cubic root of 111180661 is about 480.8501441445.

The spelling of 111180661 in words is "one hundred eleven million, one hundred eighty thousand, six hundred sixty-one".