2158161771 has 16 divisors (see below), whose sum is σ = 2894808960. Its totient is φ = 1430170560.

The previous prime is 2158161769. The next prime is 2158161773. The reversal of 2158161771 is 1771618512.

2158161771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2158161769) and next prime (2158161773).

It is not a de Polignac number, because 2158161771 - 2¹ = 2158161769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2158161773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370560 + ... + 376338.

It is an arithmetic number, because the mean of its divisors is an integer number (180925560).

Almost surely, 2^2158161771 is an apocalyptic number.

2158161771 is a deficient number, since it is larger than the sum of its proper divisors (736647189).

2158161771 is a wasteful number, since it uses less digits than its factorization.

2158161771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6506.

The product of its digits is 23520, while the sum is 39.

The square root of 2158161771 is about 46456.0197498666. The cubic root of 2158161771 is about 1292.2940113972.

The spelling of 2158161771 in words is "two billion, one hundred fifty-eight million, one hundred sixty-one thousand, seven hundred seventy-one".