2197581 has 8 divisors (see below), whose sum is σ = 3057600. Its totient is φ = 1401312.

The previous prime is 2197567. The next prime is 2197589. The reversal of 2197581 is 1857912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2197581 - 2⁷ = 2197453 is a prime.

It is a super-2 number, since 2×2197581² = 9658724503122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2197589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15856 + ... + 15993.

It is an arithmetic number, because the mean of its divisors is an integer number (382200).

2^2197581 is an apocalyptic number.

It is an amenable number.

2197581 is a deficient number, since it is larger than the sum of its proper divisors (860019).

2197581 is a wasteful number, since it uses less digits than its factorization.

2197581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31875.

The product of its digits is 5040, while the sum is 33.

The square root of 2197581 is about 1482.4240284075. The cubic root of 2197581 is about 130.0114585561.

The spelling of 2197581 in words is "two million, one hundred ninety-seven thousand, five hundred eighty-one".