2660581 has 16 divisors (see below), whose sum is σ = 3358080. Its totient is φ = 2047680.

The previous prime is 2660579. The next prime is 2660587. The reversal of 2660581 is 1850662.

2660581 = T₃₄ + T₃₅ + ... + T₂₅₁.

It is a cyclic number.

It is not a de Polignac number, because 2660581 - 2¹ = 2660579 is a prime.

It is a super-2 number, since 2×2660581² = 14157382515122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8235 + ... + 8551.

It is an arithmetic number, because the mean of its divisors is an integer number (209880).

2^2660581 is an apocalyptic number.

It is an amenable number.

2660581 is a deficient number, since it is larger than the sum of its proper divisors (697499).

2660581 is a wasteful number, since it uses less digits than its factorization.

2660581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2660581 is about 1631.1287502831. The cubic root of 2660581 is about 138.5666853819.

The spelling of 2660581 in words is "two million, six hundred sixty thousand, five hundred eighty-one".