75181681 has 4 divisors (see below), whose sum is σ = 75240000. Its totient is φ = 75123364.

The previous prime is 75181679. The next prime is 75181697. The reversal of 75181681 is 18618157.

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 75181681 - 2¹ = 75181679 is a prime.

It is a super-2 number, since 2×75181681² = 11304570315971522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75181681.

It is not an unprimeable number, because it can be changed into a prime (75185681) 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, 27181 + ... + 29818.

It is an arithmetic number, because the mean of its divisors is an integer number (18810000).

Almost surely, 2^75181681 is an apocalyptic number.

It is an amenable number.

75181681 is a deficient number, since it is larger than the sum of its proper divisors (58319).

75181681 is a wasteful number, since it uses less digits than its factorization.

75181681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58318.

The product of its digits is 13440, while the sum is 37.

The square root of 75181681 is about 8670.7370505627. The cubic root of 75181681 is about 422.0565818129.

The spelling of 75181681 in words is "seventy-five million, one hundred eighty-one thousand, six hundred eighty-one".