75290321 has 2 divisors, whose sum is σ = 75290322. Its totient is φ = 75290320.

The previous prime is 75290269. The next prime is 75290357. The reversal of 75290321 is 12309257.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67650625 + 7639696 = 8225^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 75290321 - 2²² = 71096017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75290221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37645160 + 37645161.

It is an arithmetic number, because the mean of its divisors is an integer number (37645161).

Almost surely, 2^75290321 is an apocalyptic number.

It is an amenable number.

75290321 is a deficient number, since it is larger than the sum of its proper divisors (1).

75290321 is an equidigital number, since it uses as much as digits as its factorization.

75290321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 75290321 is about 8676.9995390112. Note that the first 3 decimals coincide. The cubic root of 75290321 is about 422.2597791794.

Adding to 75290321 its reverse (12309257), we get a palindrome (87599578).

The spelling of 75290321 in words is "seventy-five million, two hundred ninety thousand, three hundred twenty-one".