2111161509 has 8 divisors (see below), whose sum is σ = 3127646720. Its totient is φ = 1407440988.

The previous prime is 2111161501. The next prime is 2111161511. The reversal of 2111161509 is 9051611112.

It is not a de Polignac number, because 2111161509 - 2³ = 2111161501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 78191167 = 2111161509 / (2 + 1 + 1 + 1 + 1 + 6 + 1 + 5 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111161501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39095557 + ... + 39095610.

It is an arithmetic number, because the mean of its divisors is an integer number (390955840).

Almost surely, 2^2111161509 is an apocalyptic number.

It is an amenable number.

2111161509 is a deficient number, since it is larger than the sum of its proper divisors (1016485211).

2111161509 is an equidigital number, since it uses as much as digits as its factorization.

2111161509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78191176 (or 78191170 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 27.

The square root of 2111161509 is about 45947.3776074326. The cubic root of 2111161509 is about 1282.8439185724.

The spelling of 2111161509 in words is "two billion, one hundred eleven million, one hundred sixty-one thousand, five hundred nine".