111661613 has 16 divisors (see below), whose sum is σ = 137195520. Its totient is φ = 88738416.

The previous prime is 111661609. The next prime is 111661637. The reversal of 111661613 is 316166111.

It is a cyclic number.

It is not a de Polignac number, because 111661613 - 2² = 111661609 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111661663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2681 + ... + 15182.

It is an arithmetic number, because the mean of its divisors is an integer number (8574720).

Almost surely, 2^111661613 is an apocalyptic number.

It is an amenable number.

111661613 is a deficient number, since it is larger than the sum of its proper divisors (25533907).

111661613 is a wasteful number, since it uses less digits than its factorization.

111661613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17936.

The product of its digits is 648, while the sum is 26.

The square root of 111661613 is about 10567.0058673212. The cubic root of 111661613 is about 481.5425102479.

The spelling of 111661613 in words is "one hundred eleven million, six hundred sixty-one thousand, six hundred thirteen".