75825391 has 2 divisors, whose sum is σ = 75825392. Its totient is φ = 75825390.

The previous prime is 75825331. The next prime is 75825427. The reversal of 75825391 is 19352857.

It is a strong prime.

It is an emirp because it is prime and its reverse (19352857) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75825391 - 2²³ = 67436783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75825331) 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, 37912695 + 37912696.

It is an arithmetic number, because the mean of its divisors is an integer number (37912696).

Almost surely, 2^75825391 is an apocalyptic number.

75825391 is a deficient number, since it is larger than the sum of its proper divisors (1).

75825391 is an equidigital number, since it uses as much as digits as its factorization.

75825391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 75825391 is about 8707.7776154424. Note that the first 3 decimals coincide. The cubic root of 75825391 is about 423.2577180477.

The spelling of 75825391 in words is "seventy-five million, eight hundred twenty-five thousand, three hundred ninety-one".