75145321 has 8 divisors (see below), whose sum is σ = 79985664. Its totient is φ = 70351680.

The previous prime is 75145307. The next prime is 75145327. The reversal of 75145321 is 12354157.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75145321 - 2⁵ = 75145289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75145321.

It is not an unprimeable number, because it can be changed into a prime (75145327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8325 + ... + 14818.

It is an arithmetic number, because the mean of its divisors is an integer number (9998208).

Almost surely, 2^75145321 is an apocalyptic number.

It is an amenable number.

75145321 is a deficient number, since it is larger than the sum of its proper divisors (4840343).

75145321 is a wasteful number, since it uses less digits than its factorization.

75145321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23351.

The product of its digits is 4200, while the sum is 28.

The square root of 75145321 is about 8668.6400894258. The cubic root of 75145321 is about 421.9885313176.

Adding to 75145321 its reverse (12354157), we get a palindrome (87499478).

It can be divided in two parts, 75145 and 321, that added together give a triangular number (75466 = T₃₈₈).

The spelling of 75145321 in words is "seventy-five million, one hundred forty-five thousand, three hundred twenty-one".