73481981 has 4 divisors (see below), whose sum is σ = 73501692. Its totient is φ = 73462272.

The previous prime is 73481977. The next prime is 73482011. The reversal of 73481981 is 18918437.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22944100 + 50537881 = 4790^2 + 7109^2 .

It is a cyclic number.

It is not a de Polignac number, because 73481981 - 2² = 73481977 is a prime.

It is a super-3 number, since 3×73481981³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73481971) 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, 2366 + ... + 12351.

It is an arithmetic number, because the mean of its divisors is an integer number (18375423).

Almost surely, 2^73481981 is an apocalyptic number.

It is an amenable number.

73481981 is a deficient number, since it is larger than the sum of its proper divisors (19711).

73481981 is a wasteful number, since it uses less digits than its factorization.

73481981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19710.

The product of its digits is 48384, while the sum is 41.

The square root of 73481981 is about 8572.1631459043. The cubic root of 73481981 is about 418.8517027495.

The spelling of 73481981 in words is "seventy-three million, four hundred eighty-one thousand, nine hundred eighty-one".