2947221 has 6 divisors (see below), whose sum is σ = 4257110. Its totient is φ = 1964808.

The previous prime is 2947213. The next prime is 2947249. The reversal of 2947221 is 1227492.

It can be written as a sum of positive squares in only one way, i.e., 2604996 + 342225 = 1614^2 + 585^2 .

It is not a de Polignac number, because 2947221 - 2³ = 2947213 is a prime.

It is a super-2 number, since 2×2947221² = 17372223245682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2947211) 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, 163726 + ... + 163743.

2^2947221 is an apocalyptic number.

It is an amenable number.

2947221 is a deficient number, since it is larger than the sum of its proper divisors (1309889).

2947221 is a wasteful number, since it uses less digits than its factorization.

2947221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327475 (or 327472 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 2947221 is about 1716.7472149388. The cubic root of 2947221 is about 143.3741647989.

The spelling of 2947221 in words is "two million, nine hundred forty-seven thousand, two hundred twenty-one".