2197971 has 6 divisors (see below), whose sum is σ = 3174860. Its totient is φ = 1465308.

The previous prime is 2197961. The next prime is 2197973. The reversal of 2197971 is 1797912.

It is not a de Polignac number, because 2197971 - 2⁶ = 2197907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2197973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122101 + ... + 122118.

2^2197971 is an apocalyptic number.

2197971 is a deficient number, since it is larger than the sum of its proper divisors (976889).

2197971 is a wasteful number, since it uses less digits than its factorization.

2197971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244225 (or 244222 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 2197971 is about 1482.5555638829. Note that the first 4 decimals coincide. The cubic root of 2197971 is about 130.0191490530.

The spelling of 2197971 in words is "two million, one hundred ninety-seven thousand, nine hundred seventy-one".