2170157871 has 16 divisors (see below), whose sum is σ = 3311020800. Its totient is φ = 1238547648.

The previous prime is 2170157867. The next prime is 2170157947. The reversal of 2170157871 is 1787510712.

It is not a de Polignac number, because 2170157871 - 2² = 2170157867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170157851) 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, 46881 + ... + 80858.

It is an arithmetic number, because the mean of its divisors is an integer number (206938800).

Almost surely, 2^2170157871 is an apocalyptic number.

2170157871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2170157871 is a deficient number, since it is larger than the sum of its proper divisors (1140862929).

2170157871 is a wasteful number, since it uses less digits than its factorization.

2170157871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128558.

The product of its (nonzero) digits is 27440, while the sum is 39.

The square root of 2170157871 is about 46584.9532681959. The cubic root of 2170157871 is about 1294.6839856404.

The spelling of 2170157871 in words is "two billion, one hundred seventy million, one hundred fifty-seven thousand, eight hundred seventy-one".