73019921 has 4 divisors (see below), whose sum is σ = 78636852. Its totient is φ = 67402992.

The previous prime is 73019909. The next prime is 73019939. The reversal of 73019921 is 12991037.

It is a happy number.

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 18835600 + 54184321 = 4340^2 + 7361^2 .

It is a cyclic number.

It is not a de Polignac number, because 73019921 - 2⁶ = 73019857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73019021) 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, 2808446 + ... + 2808471.

It is an arithmetic number, because the mean of its divisors is an integer number (19659213).

Almost surely, 2^73019921 is an apocalyptic number.

It is an amenable number.

73019921 is a deficient number, since it is larger than the sum of its proper divisors (5616931).

73019921 is a wasteful number, since it uses less digits than its factorization.

73019921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5616930.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 73019921 is about 8545.1694541419. The cubic root of 73019921 is about 417.9719329002.

The spelling of 73019921 in words is "seventy-three million, nineteen thousand, nine hundred twenty-one".