7543681 has 4 divisors (see below), whose sum is σ = 7671600. Its totient is φ = 7415764.

The previous prime is 7543661. The next prime is 7543709. The reversal of 7543681 is 1863457.

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 7543681 - 2⁹ = 7543169 is a prime.

It is a super-2 number, since 2×7543681² = 113814246059522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7543651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63871 + ... + 63988.

It is an arithmetic number, because the mean of its divisors is an integer number (1917900).

Almost surely, 2^7543681 is an apocalyptic number.

It is an amenable number.

7543681 is a deficient number, since it is larger than the sum of its proper divisors (127919).

7543681 is a wasteful number, since it uses less digits than its factorization.

7543681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127918.

The product of its digits is 20160, while the sum is 34.

The square root of 7543681 is about 2746.5762323300. The cubic root of 7543681 is about 196.1226585418.

The spelling of 7543681 in words is "seven million, five hundred forty-three thousand, six hundred eighty-one".