73000181 has 4 divisors (see below), whose sum is σ = 73018764. Its totient is φ = 72981600.

The previous prime is 73000177. The next prime is 73000189. The reversal of 73000181 is 18100037.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18100037 = 2833 ⋅6389.

It can be written as a sum of positive squares in 2 ways, for example, as 66161956 + 6838225 = 8134^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 73000181 - 2² = 73000177 is a prime.

It is a super-2 number, since 2×73000181² = 10658052852065522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73000189) 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, 830 + ... + 12111.

It is an arithmetic number, because the mean of its divisors is an integer number (18254691).

Almost surely, 2^73000181 is an apocalyptic number.

It is an amenable number.

73000181 is a deficient number, since it is larger than the sum of its proper divisors (18583).

73000181 is a wasteful number, since it uses less digits than its factorization.

73000181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18582.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 73000181 is about 8544.0143375348. The cubic root of 73000181 is about 417.9342650535.

The spelling of 73000181 in words is "seventy-three million, one hundred eighty-one", and thus it is an aban number.