75312217 has 4 divisors (see below), whose sum is σ = 77909220. Its totient is φ = 72715216.

The previous prime is 75312191. The next prime is 75312233. The reversal of 75312217 is 71221357.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53231616 + 22080601 = 7296^2 + 4699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75312217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75312277) 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, 1298458 + ... + 1298515.

It is an arithmetic number, because the mean of its divisors is an integer number (19477305).

Almost surely, 2^75312217 is an apocalyptic number.

It is an amenable number.

75312217 is a deficient number, since it is larger than the sum of its proper divisors (2597003).

75312217 is a wasteful number, since it uses less digits than its factorization.

75312217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597002.

The product of its digits is 2940, while the sum is 28.

The square root of 75312217 is about 8678.2611737606. The cubic root of 75312217 is about 422.3007092036.

The spelling of 75312217 in words is "seventy-five million, three hundred twelve thousand, two hundred seventeen".