2371681 has 8 divisors (see below), whose sum is σ = 2568104. Its totient is φ = 2177280.

The previous prime is 2371679. The next prime is 2371693. The reversal of 2371681 is 1861732.

It can be written as a sum of positive squares in 4 ways, for example, as 341056 + 2030625 = 584^2 + 1425^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2371681 - 2¹ = 2371679 is a prime.

It is a super-2 number, since 2×2371681² = 11249741531522, which contains 22 as substring.

It is a deceptive number, since it divides R_2371680.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2371631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2755 + ... + 3511.

It is an arithmetic number, because the mean of its divisors is an integer number (321013).

2^2371681 is an apocalyptic number.

It is an amenable number.

2371681 is a deficient number, since it is larger than the sum of its proper divisors (196423).

2371681 is a wasteful number, since it uses less digits than its factorization.

2371681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011.

The product of its digits is 2016, while the sum is 28.

The square root of 2371681 is about 1540.0262984768. The cubic root of 2371681 is about 133.3579031111.

It can be divided in two parts, 237168 and 1, that added together give a square (237169 = 487²).

The spelling of 2371681 in words is "two million, three hundred seventy-one thousand, six hundred eighty-one".