2139165181 has 2 divisors, whose sum is σ = 2139165182. Its totient is φ = 2139165180.

The previous prime is 2139165167. The next prime is 2139165211. The reversal of 2139165181 is 1815619312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1976602681 + 162562500 = 44459^2 + 12750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139165181 is a prime.

It is a super-2 number, since 2×2139165181² = 9152055343205525522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2139165181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2139165121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069582590 + 1069582591.

It is an arithmetic number, because the mean of its divisors is an integer number (1069582591).

Almost surely, 2^2139165181 is an apocalyptic number.

It is an amenable number.

2139165181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139165181 is an equidigital number, since it uses as much as digits as its factorization.

2139165181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 37.

The square root of 2139165181 is about 46251.1100515436. The cubic root of 2139165181 is about 1288.4911511522.

It can be divided in two parts, 2139165 and 181, that added together give a triangular number (2139346 = T₂₀₆₈).

The spelling of 2139165181 in words is "two billion, one hundred thirty-nine million, one hundred sixty-five thousand, one hundred eighty-one".