2209491 has 32 divisors (see below), whose sum is σ = 3552000. Its totient is φ = 1353024.

The previous prime is 2209483. The next prime is 2209499. The reversal of 2209491 is 1949022.

It is an interprime number because it is at equal distance from previous prime (2209483) and next prime (2209499).

It is not a de Polignac number, because 2209491 - 2³ = 2209483 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2209499) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30231 + ... + 30303.

It is an arithmetic number, because the mean of its divisors is an integer number (111000).

2^2209491 is an apocalyptic number.

2209491 is a deficient number, since it is larger than the sum of its proper divisors (1342509).

2209491 is a wasteful number, since it uses less digits than its factorization.

2209491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 2209491 is about 1486.4356696474. The cubic root of 2209491 is about 130.2459053658.

The spelling of 2209491 in words is "two million, two hundred nine thousand, four hundred ninety-one".