2120581 has 6 divisors (see below), whose sum is σ = 2180850. Its totient is φ = 2061936.

The previous prime is 2120579. The next prime is 2120611. The reversal of 2120581 is 1850212.

It is the 595-th star number.

It can be written as a sum of positive squares in 3 ways, for example, as 1018081 + 1102500 = 1009^2 + 1050^2 .

It is not a de Polignac number, because 2120581 - 2¹ = 2120579 is a prime.

It is a super-2 number, since 2×2120581² = 8993727555122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120551) 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, 595 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (363475).

2^2120581 is an apocalyptic number.

It is an amenable number.

2120581 is a deficient number, since it is larger than the sum of its proper divisors (60269).

2120581 is an equidigital number, since it uses as much as digits as its factorization.

2120581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1586 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2120581 is about 1456.2214804074. The cubic root of 2120581 is about 128.4749000923.

Adding to 2120581 its reverse (1850212), we get a palindrome (3970793).

It can be divided in two parts, 2120 and 581, that added together give a triangular number (2701 = T₇₃).

The spelling of 2120581 in words is "two million, one hundred twenty thousand, five hundred eighty-one".