75391 has 2 divisors, whose sum is σ = 75392. Its totient is φ = 75390.

The previous prime is 75389. The next prime is 75401. The reversal of 75391 is 19357.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 75391 - 2¹ = 75389 is a prime.

Together with 75389, it forms a pair of twin primes.

75391 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75991) 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 as a sum of consecutive naturals, namely, 37695 + 37696.

It is an arithmetic number, because the mean of its divisors is an integer number (37696).

2⁷⁵³⁹¹ is an apocalyptic number.

75391 is a deficient number, since it is larger than the sum of its proper divisors (1).

75391 is an equidigital number, since it uses as much as digits as its factorization.

75391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 945, while the sum is 25.

The square root of 75391 is about 274.5742158324. The cubic root of 75391 is about 42.2447912069.

The spelling of 75391 in words is "seventy-five thousand, three hundred ninety-one".