2113111145 has 4 divisors (see below), whose sum is σ = 2535733380. Its totient is φ = 1690488912.

The previous prime is 2113111139. The next prime is 2113111157. The reversal of 2113111145 is 5411113112.

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 488940544 + 1624170601 = 22112^2 + 40301^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113111145 - 2⁶ = 2113111081 is a prime.

It is a super-2 number, since 2×2113111145² = 8930477422246422050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211311110 + ... + 211311119.

It is an arithmetic number, because the mean of its divisors is an integer number (633933345).

Almost surely, 2^2113111145 is an apocalyptic number.

It is an amenable number.

2113111145 is a deficient number, since it is larger than the sum of its proper divisors (422622235).

2113111145 is an equidigital number, since it uses as much as digits as its factorization.

2113111145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422622234.

The product of its digits is 120, while the sum is 20.

The square root of 2113111145 is about 45968.5886774872. The cubic root of 2113111145 is about 1283.2386948071.

Adding to 2113111145 its reverse (5411113112), we get a palindrome (7524224257).

The spelling of 2113111145 in words is "two billion, one hundred thirteen million, one hundred eleven thousand, one hundred forty-five".