111345161 has 2 divisors, whose sum is σ = 111345162. Its totient is φ = 111345160.

The previous prime is 111345119. The next prime is 111345193. The reversal of 111345161 is 161543111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91489225 + 19855936 = 9565^2 + 4456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111345161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (111341161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55672580 + 55672581.

It is an arithmetic number, because the mean of its divisors is an integer number (55672581).

Almost surely, 2^111345161 is an apocalyptic number.

It is an amenable number.

111345161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111345161 is an equidigital number, since it uses as much as digits as its factorization.

111345161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 23.

The square root of 111345161 is about 10552.0216546404. The cubic root of 111345161 is about 481.0871783813.

Adding to 111345161 its reverse (161543111), we get a palindrome (272888272).

The spelling of 111345161 in words is "one hundred eleven million, three hundred forty-five thousand, one hundred sixty-one".