111613121 has 2 divisors, whose sum is σ = 111613122. Its totient is φ = 111613120.

The previous prime is 111613097. The next prime is 111613129. The reversal of 111613121 is 121316111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111534721 + 78400 = 10561^2 + 280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111613121 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111613121.

It is not a weakly prime, because it can be changed into another prime (111613129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55806560 + 55806561.

It is an arithmetic number, because the mean of its divisors is an integer number (55806561).

Almost surely, 2^111613121 is an apocalyptic number.

It is an amenable number.

111613121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111613121 is an equidigital number, since it uses as much as digits as its factorization.

111613121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 17.

The square root of 111613121 is about 10564.7111176785. The cubic root of 111613121 is about 481.4727926435.

Adding to 111613121 its reverse (121316111), we get a palindrome (232929232).

The spelling of 111613121 in words is "one hundred eleven million, six hundred thirteen thousand, one hundred twenty-one".