73215481 has 4 divisors (see below), whose sum is σ = 77522292. Its totient is φ = 68908672.

The previous prime is 73215479. The next prime is 73215487. The reversal of 73215481 is 18451237.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18451237 = 7 ⋅2635891.

It can be written as a sum of positive squares in 2 ways, for example, as 26429881 + 46785600 = 5141^2 + 6840^2 .

It is a cyclic number.

It is not a de Polignac number, because 73215481 - 2¹ = 73215479 is a prime.

It is a super-2 number, since 2×73215481² = 10721013316122722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73215487) 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, 2153380 + ... + 2153413.

It is an arithmetic number, because the mean of its divisors is an integer number (19380573).

Almost surely, 2^73215481 is an apocalyptic number.

It is an amenable number.

73215481 is a deficient number, since it is larger than the sum of its proper divisors (4306811).

73215481 is a wasteful number, since it uses less digits than its factorization.

73215481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306810.

The product of its digits is 6720, while the sum is 31.

The square root of 73215481 is about 8556.6045251607. The cubic root of 73215481 is about 418.3447340410.

The spelling of 73215481 in words is "seventy-three million, two hundred fifteen thousand, four hundred eighty-one".