2961681 has 4 divisors (see below), whose sum is σ = 3948912. Its totient is φ = 1974452.

The previous prime is 2961677. The next prime is 2961691. The reversal of 2961681 is 1861692.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2961681 - 2² = 2961677 is a prime.

It is a super-2 number, since 2×2961681² = 17543108691522, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2961671) 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, 493611 + ... + 493616.

It is an arithmetic number, because the mean of its divisors is an integer number (987228).

2^2961681 is an apocalyptic number.

It is an amenable number.

2961681 is a deficient number, since it is larger than the sum of its proper divisors (987231).

2961681 is an equidigital number, since it uses as much as digits as its factorization.

2961681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987230.

The product of its digits is 5184, while the sum is 33.

The square root of 2961681 is about 1720.9535147702. The cubic root of 2961681 is about 143.6082620562.

The spelling of 2961681 in words is "two million, nine hundred sixty-one thousand, six hundred eighty-one".