2920681 has 3 divisors (see below), whose sum is σ = 2922391. Its totient is φ = 2918972.

The previous prime is 2920649. The next prime is 2920691. The reversal of 2920681 is 1860292.

It is a happy number.

The square root of 2920681 is 1709.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 2371600 = 741^2 + 1540^2 .

It is not a de Polignac number, because 2920681 - 2⁵ = 2920649 is a prime.

It is a super-2 number, since 2×2920681² = 17060755007522, which contains 22 as substring.

It is a Duffinian number.

2920681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2920691) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 855 + ... + 2563.

2^2920681 is an apocalyptic number.

2920681 is the 1709-th square number.

2920681 is the 855-th centered octagonal number.

It is an amenable number.

2920681 is a deficient number, since it is larger than the sum of its proper divisors (1710).

2920681 is an frugal number, since it uses more digits than its factorization.

2920681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The cubic root of 2920681 is about 142.9425005597.

The spelling of 2920681 in words is "two million, nine hundred twenty thousand, six hundred eighty-one".