111161081 has 4 divisors (see below), whose sum is σ = 111374964. Its totient is φ = 110947200.

The previous prime is 111161053. The next prime is 111161101. The reversal of 111161081 is 180161111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29800681 + 81360400 = 5459^2 + 9020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111161081 is a prime.

It is a super-2 number, since 2×111161081² = 24713571858177122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111161021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106160 + ... + 107201.

It is an arithmetic number, because the mean of its divisors is an integer number (27843741).

Almost surely, 2^111161081 is an apocalyptic number.

It is an amenable number.

111161081 is a deficient number, since it is larger than the sum of its proper divisors (213883).

111161081 is an equidigital number, since it uses as much as digits as its factorization.

111161081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213882.

The product of its (nonzero) digits is 48, while the sum is 20.

The square root of 111161081 is about 10543.2955474083. The cubic root of 111161081 is about 480.8219150188.

The spelling of 111161081 in words is "one hundred eleven million, one hundred sixty-one thousand, eighty-one".