75991321 has 8 divisors (see below), whose sum is σ = 88037504. Its totient is φ = 64242720.

The previous prime is 75991313. The next prime is 75991367. The reversal of 75991321 is 12319957.

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 75991321 - 2³ = 75991313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75991301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73845 + ... + 74866.

It is an arithmetic number, because the mean of its divisors is an integer number (11004688).

Almost surely, 2^75991321 is an apocalyptic number.

It is an amenable number.

75991321 is a deficient number, since it is larger than the sum of its proper divisors (12046183).

75991321 is a wasteful number, since it uses less digits than its factorization.

75991321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148791.

The product of its digits is 17010, while the sum is 37.

The square root of 75991321 is about 8717.3000980808. The cubic root of 75991321 is about 423.5662338148.

The spelling of 75991321 in words is "seventy-five million, nine hundred ninety-one thousand, three hundred twenty-one".