2158561 has 8 divisors (see below), whose sum is σ = 2246400. Its totient is φ = 2071920.

The previous prime is 2158549. The next prime is 2158567. The reversal of 2158561 is 1658512.

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

It is a cyclic number.

It is not a de Polignac number, because 2158561 - 2⁷ = 2158433 is a prime.

It is a Duffinian number.

2158561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2158567) 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, 5355 + ... + 5743.

It is an arithmetic number, because the mean of its divisors is an integer number (280800).

2^2158561 is an apocalyptic number.

It is an amenable number.

2158561 is a deficient number, since it is larger than the sum of its proper divisors (87839).

2158561 is a wasteful number, since it uses less digits than its factorization.

2158561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599.

The product of its digits is 2400, while the sum is 28.

The square root of 2158561 is about 1469.2042063648. The cubic root of 2158561 is about 129.2373691775.

The spelling of 2158561 in words is "two million, one hundred fifty-eight thousand, five hundred sixty-one".