75380521 has 4 divisors (see below), whose sum is σ = 75413844. Its totient is φ = 75347200.

The previous prime is 75380479. The next prime is 75380531. The reversal of 75380521 is 12508357.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12508357 = 127 ⋅98491.

It can be written as a sum of positive squares in 2 ways, for example, as 42719296 + 32661225 = 6536^2 + 5715^2 .

It is a cyclic number.

It is not a de Polignac number, because 75380521 - 2⁹ = 75380009 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75380531) 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, 13000 + ... + 17881.

It is an arithmetic number, because the mean of its divisors is an integer number (18853461).

Almost surely, 2^75380521 is an apocalyptic number.

It is an amenable number.

75380521 is a deficient number, since it is larger than the sum of its proper divisors (33323).

75380521 is a wasteful number, since it uses less digits than its factorization.

75380521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33322.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 75380521 is about 8682.1956324423. The cubic root of 75380521 is about 422.4283383939.

Adding to 75380521 its reverse (12508357), we get a palindrome (87888878).

The spelling of 75380521 in words is "seventy-five million, three hundred eighty thousand, five hundred twenty-one".