2520681 has 8 divisors (see below), whose sum is σ = 3373920. Its totient is φ = 1673952.

The previous prime is 2520677. The next prime is 2520689. The reversal of 2520681 is 1860252.

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

It is not a de Polignac number, because 2520681 - 2² = 2520677 is a prime.

It is a super-2 number, since 2×2520681² = 12707665407522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2520689) 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, 636 + ... + 2333.

It is an arithmetic number, because the mean of its divisors is an integer number (421740).

2^2520681 is an apocalyptic number.

2520681 is the 849-th nonagonal number.

It is an amenable number.

2520681 is a deficient number, since it is larger than the sum of its proper divisors (853239).

2520681 is a wasteful number, since it uses less digits than its factorization.

2520681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 2520681 is about 1587.6652669880. The cubic root of 2520681 is about 136.0940993810.

It can be divided in two parts, 25 and 20681, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 2520681 in words is "two million, five hundred twenty thousand, six hundred eighty-one".