2139165169 has 4 divisors (see below), whose sum is σ = 2139257844. Its totient is φ = 2139072496.

The previous prime is 2139165167. The next prime is 2139165181. The reversal of 2139165169 is 9615619312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 413593569 + 1725571600 = 20337^2 + 41540^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139165169 - 2¹ = 2139165167 is a prime.

It is a super-2 number, since 2×2139165169² = 9152055240525597122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139165167) 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, 18939 + ... + 68095.

It is an arithmetic number, because the mean of its divisors is an integer number (534814461).

Almost surely, 2^2139165169 is an apocalyptic number.

It is an amenable number.

2139165169 is a deficient number, since it is larger than the sum of its proper divisors (92675).

2139165169 is an equidigital number, since it uses as much as digits as its factorization.

2139165169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92674.

The product of its digits is 87480, while the sum is 43.

The square root of 2139165169 is about 46251.1099218170. The cubic root of 2139165169 is about 1288.4911487428.

The spelling of 2139165169 in words is "two billion, one hundred thirty-nine million, one hundred sixty-five thousand, one hundred sixty-nine".