111087161 has 4 divisors (see below), whose sum is σ = 112908324. Its totient is φ = 109266000.

The previous prime is 111087149. The next prime is 111087181. The reversal of 111087161 is 161780111.

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 29365561 + 81721600 = 5419^2 + 9040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111087161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111087161.

It is not an unprimeable number, because it can be changed into a prime (111087131) 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, 910490 + ... + 910611.

It is an arithmetic number, because the mean of its divisors is an integer number (28227081).

Almost surely, 2^111087161 is an apocalyptic number.

It is an amenable number.

111087161 is a deficient number, since it is larger than the sum of its proper divisors (1821163).

111087161 is an equidigital number, since it uses as much as digits as its factorization.

111087161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821162.

The product of its (nonzero) digits is 336, while the sum is 26.

The square root of 111087161 is about 10539.7894191488. The cubic root of 111087161 is about 480.7153122495.

The spelling of 111087161 in words is "one hundred eleven million, eighty-seven thousand, one hundred sixty-one".