2170881 has 10 divisors (see below), whose sum is σ = 3243042. Its totient is φ = 1447200.

The previous prime is 2170877. The next prime is 2170897. The reversal of 2170881 is 1880712.

It can be written as a sum of positive squares in only one way, i.e., 1703025 + 467856 = 1305^2 + 684^2 .

It is not a de Polignac number, because 2170881 - 2² = 2170877 is a prime.

It is a super-2 number, since 2×2170881² = 9425448632322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2170871) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13320 + ... + 13481.

It is a Proth number, since it is equal to 265 ⋅ 2¹³ + 1 and 265 < 2¹³.

2^2170881 is an apocalyptic number.

It is an amenable number.

2170881 is a deficient number, since it is larger than the sum of its proper divisors (1072161).

2170881 is an equidigital number, since it uses as much as digits as its factorization.

2170881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26813 (or 26804 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 2170881 is about 1473.3909868056. The cubic root of 2170881 is about 129.4827772348.

The spelling of 2170881 in words is "two million, one hundred seventy thousand, eight hundred eighty-one".