73522181 has 4 divisors (see below), whose sum is σ = 73598412. Its totient is φ = 73445952.

The previous prime is 73522157. The next prime is 73522187. The reversal of 73522181 is 18122537.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18122537 = 71 ⋅255247.

It can be written as a sum of positive squares in 2 ways, for example, as 61481281 + 12040900 = 7841^2 + 3470^2 .

It is a cyclic number.

It is not a de Polignac number, because 73522181 - 2⁶ = 73522117 is a prime.

It is a super-2 number, since 2×73522181² = 10811022197993522, 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 (73522187) 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, 36650 + ... + 38603.

It is an arithmetic number, because the mean of its divisors is an integer number (18399603).

Almost surely, 2^73522181 is an apocalyptic number.

It is an amenable number.

73522181 is a deficient number, since it is larger than the sum of its proper divisors (76231).

73522181 is an equidigital number, since it uses as much as digits as its factorization.

73522181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76230.

The product of its digits is 3360, while the sum is 29.

The square root of 73522181 is about 8574.5076243479. The cubic root of 73522181 is about 418.9280696295.

The spelling of 73522181 in words is "seventy-three million, five hundred twenty-two thousand, one hundred eighty-one".