75147917 has 4 divisors (see below), whose sum is σ = 80928540. Its totient is φ = 69367296.

The previous prime is 75147911. The next prime is 75147929. The reversal of 75147917 is 71974157.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71974157 = 31 ⋅2321747.

It can be written as a sum of positive squares in 2 ways, for example, as 4268356 + 70879561 = 2066^2 + 8419^2 .

It is a cyclic number.

It is not a de Polignac number, because 75147917 - 2⁸ = 75147661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75147911) 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, 2890292 + ... + 2890317.

It is an arithmetic number, because the mean of its divisors is an integer number (20232135).

Almost surely, 2^75147917 is an apocalyptic number.

It is an amenable number.

75147917 is a deficient number, since it is larger than the sum of its proper divisors (5780623).

75147917 is a wasteful number, since it uses less digits than its factorization.

75147917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780622.

The product of its digits is 61740, while the sum is 41.

The square root of 75147917 is about 8668.7898232683. The cubic root of 75147917 is about 421.9933906559.

The spelling of 75147917 in words is "seventy-five million, one hundred forty-seven thousand, nine hundred seventeen".