2897681 has 4 divisors (see below), whose sum is σ = 2927652. Its totient is φ = 2867712.

The previous prime is 2897627. The next prime is 2897689. The reversal of 2897681 is 1867982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2190400 + 707281 = 1480^2 + 841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2897681 is a prime.

It is a super-2 number, since 2×2897681² = 16793110355522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2897689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14840 + ... + 15033.

It is an arithmetic number, because the mean of its divisors is an integer number (731913).

2^2897681 is an apocalyptic number.

It is an amenable number.

2897681 is a deficient number, since it is larger than the sum of its proper divisors (29971).

2897681 is an equidigital number, since it uses as much as digits as its factorization.

2897681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29970.

The product of its digits is 48384, while the sum is 41.

The square root of 2897681 is about 1702.2576185760. The cubic root of 2897681 is about 142.5662931518.

The spelling of 2897681 in words is "two million, eight hundred ninety-seven thousand, six hundred eighty-one".