7201681 has 4 divisors (see below), whose sum is σ = 7208512. Its totient is φ = 7194852.

The previous prime is 7201673. The next prime is 7201687. The reversal of 7201681 is 1861027.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1861027 = 7 ⋅265861.

It is a cyclic number.

It is not a de Polignac number, because 7201681 - 2³ = 7201673 is a prime.

It is a super-2 number, since 2×7201681² = 103728418451522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7201687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1461 + ... + 4066.

It is an arithmetic number, because the mean of its divisors is an integer number (1802128).

Almost surely, 2^7201681 is an apocalyptic number.

It is an amenable number.

7201681 is a deficient number, since it is larger than the sum of its proper divisors (6831).

7201681 is a wasteful number, since it uses less digits than its factorization.

7201681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6830.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 7201681 is about 2683.5947905748. The cubic root of 7201681 is about 193.1129034152.

It can be divided in two parts, 720 and 1681, that added together give a 4-th power (2401 = 7⁴).

The spelling of 7201681 in words is "seven million, two hundred one thousand, six hundred eighty-one".