7133681 has 4 divisors (see below), whose sum is σ = 7379700. Its totient is φ = 6887664.

The previous prime is 7133663. The next prime is 7133701. The reversal of 7133681 is 1863317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1863317 = 31 ⋅60107.

It can be written as a sum of positive squares in 2 ways, for example, as 3097600 + 4036081 = 1760^2 + 2009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7133681 is a prime.

It is a super-2 number, since 2×7133681² = 101778809219522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 245989 = 7133681 / (7 + 1 + 3 + 3 + 6 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7133281) 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, 122966 + ... + 123023.

It is an arithmetic number, because the mean of its divisors is an integer number (1844925).

Almost surely, 2^7133681 is an apocalyptic number.

It is an amenable number.

7133681 is a deficient number, since it is larger than the sum of its proper divisors (246019).

7133681 is a wasteful number, since it uses less digits than its factorization.

7133681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246018.

The product of its digits is 3024, while the sum is 29.

The square root of 7133681 is about 2670.8951682910. The cubic root of 7133681 is about 192.5031741760.

Adding to 7133681 its reverse (1863317), we get a palindrome (8996998).

It can be divided in two parts, 71336 and 81, that added together give a palindrome (71417).

The spelling of 7133681 in words is "seven million, one hundred thirty-three thousand, six hundred eighty-one".