73555221 has 4 divisors (see below), whose sum is σ = 98073632. Its totient is φ = 49036812.

The previous prime is 73555211. The next prime is 73555231. The reversal of 73555221 is 12255537.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (73555211) and next prime (73555231).

It is not a de Polignac number, because 73555221 - 2⁹ = 73554709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73555201) 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, 12259201 + ... + 12259206.

It is an arithmetic number, because the mean of its divisors is an integer number (24518408).

Almost surely, 2^73555221 is an apocalyptic number.

It is an amenable number.

73555221 is a deficient number, since it is larger than the sum of its proper divisors (24518411).

73555221 is a wasteful number, since it uses less digits than its factorization.

73555221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24518410.

The product of its digits is 10500, while the sum is 30.

The square root of 73555221 is about 8576.4340491838. The cubic root of 73555221 is about 418.9908140075.

The spelling of 73555221 in words is "seventy-three million, five hundred fifty-five thousand, two hundred twenty-one".