2161974171 has 16 divisors (see below), whose sum is σ = 3437673984. Its totient is φ = 1181699904.

The previous prime is 2161974161. The next prime is 2161974173. The reversal of 2161974171 is 1714791612.

It is a happy number.

2161974171 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2161974171 - 2⁹ = 2161973659 is a prime.

It is a super-2 number, since 2×2161974171² = 9348264632142274482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2161974173) 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, 2237586 + ... + 2238551.

It is an arithmetic number, because the mean of its divisors is an integer number (214854624).

Almost surely, 2^2161974171 is an apocalyptic number.

2161974171 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2161974171 is a deficient number, since it is larger than the sum of its proper divisors (1275699813).

2161974171 is a wasteful number, since it uses less digits than its factorization.

2161974171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4476170.

The product of its digits is 21168, while the sum is 39.

The square root of 2161974171 is about 46497.0340021813. The cubic root of 2161974171 is about 1293.0545109982.

The spelling of 2161974171 in words is "two billion, one hundred sixty-one million, nine hundred seventy-four thousand, one hundred seventy-one".