2141581 has 8 divisors (see below), whose sum is σ = 2318904. Its totient is φ = 1966080.

The previous prime is 2141569. The next prime is 2141591. The reversal of 2141581 is 1851412.

It can be written as a sum of positive squares in 4 ways, for example, as 1020100 + 1121481 = 1010^2 + 1059^2 .

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

It is a 9-Lehmer number, since φ(2141581) divides (2141581-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 2141581 - 2⁵ = 2141549 is a prime.

It is a super-2 number, since 2×2141581² = 9172738359122, 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 (2141591) 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, 3021 + ... + 3661.

It is an arithmetic number, because the mean of its divisors is an integer number (289863).

2^2141581 is an apocalyptic number.

It is an amenable number.

2141581 is a deficient number, since it is larger than the sum of its proper divisors (177323).

2141581 is a wasteful number, since it uses less digits than its factorization.

2141581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911.

The product of its digits is 320, while the sum is 22.

The square root of 2141581 is about 1463.4141587398. The cubic root of 2141581 is about 128.8976011693.

Adding to 2141581 its reverse (1851412), we get a palindrome (3992993).

The spelling of 2141581 in words is "two million, one hundred forty-one thousand, five hundred eighty-one".