73556321 has 2 divisors, whose sum is σ = 73556322. Its totient is φ = 73556320.

The previous prime is 73556309. The next prime is 73556339. The reversal of 73556321 is 12365537.

73556321 = 6064² + 6065².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36784225 + 36772096 = 6065^2 + 6064^2 .

It is a cyclic number.

It is not a de Polignac number, because 73556321 - 2²² = 69362017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (73556221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36778160 + 36778161.

It is an arithmetic number, because the mean of its divisors is an integer number (36778161).

Almost surely, 2^73556321 is an apocalyptic number.

73556321 is the 6065-th centered square number.

It is an amenable number.

73556321 is a deficient number, since it is larger than the sum of its proper divisors (1).

73556321 is an equidigital number, since it uses as much as digits as its factorization.

73556321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 32.

The square root of 73556321 is about 8576.4981781611. The cubic root of 73556321 is about 418.9929026315.

The spelling of 73556321 in words is "seventy-three million, five hundred fifty-six thousand, three hundred twenty-one".