73281331 has 4 divisors (see below), whose sum is σ = 74985592. Its totient is φ = 71577072.

The previous prime is 73281323. The next prime is 73281337. The reversal of 73281331 is 13318237.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13318237 = 1709 ⋅7793.

It is a cyclic number.

It is not a de Polignac number, because 73281331 - 2³ = 73281323 is a prime.

It is a super-2 number, since 2×73281331² = 10740306946263122, 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 73281331.

It is not an unprimeable number, because it can be changed into a prime (73281337) 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, 852066 + ... + 852151.

It is an arithmetic number, because the mean of its divisors is an integer number (18746398).

Almost surely, 2^73281331 is an apocalyptic number.

73281331 is a deficient number, since it is larger than the sum of its proper divisors (1704261).

73281331 is a wasteful number, since it uses less digits than its factorization.

73281331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704260.

The product of its digits is 3024, while the sum is 28.

The square root of 73281331 is about 8560.4515651921. The cubic root of 73281331 is about 418.4701162033.

Adding to 73281331 its reverse (13318237), we get a palindrome (86599568).

The spelling of 73281331 in words is "seventy-three million, two hundred eighty-one thousand, three hundred thirty-one".