75343321 has 2 divisors, whose sum is σ = 75343322. Its totient is φ = 75343320.

The previous prime is 75343319. The next prime is 75343349. The reversal of 75343321 is 12334357.

It is an a-pointer prime, because the next prime (75343349) can be obtained adding 75343321 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43296400 + 32046921 = 6580^2 + 5661^2 .

It is a cyclic number.

It is not a de Polignac number, because 75343321 - 2¹ = 75343319 is a prime.

Together with 75343319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 75343321.

It is not a weakly prime, because it can be changed into another prime (75343351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37671660 + 37671661.

It is an arithmetic number, because the mean of its divisors is an integer number (37671661).

Almost surely, 2^75343321 is an apocalyptic number.

It is an amenable number.

75343321 is a deficient number, since it is larger than the sum of its proper divisors (1).

75343321 is an equidigital number, since it uses as much as digits as its factorization.

75343321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 28.

The square root of 75343321 is about 8680.0530528333. The cubic root of 75343321 is about 422.3588380346.

Adding to 75343321 its reverse (12334357), we get a palindrome (87677678).

It can be divided in two parts, 75 and 343321, that added together give a square (343396 = 586²).

The spelling of 75343321 in words is "seventy-five million, three hundred forty-three thousand, three hundred twenty-one".