74891191 has 2 divisors, whose sum is σ = 74891192. Its totient is φ = 74891190.

The previous prime is 74891189. The next prime is 74891203. The reversal of 74891191 is 19119847.

It is a weak prime.

It is an emirp because it is prime and its reverse (19119847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74891191 - 2¹ = 74891189 is a prime.

Together with 74891189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74891101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37445595 + 37445596.

It is an arithmetic number, because the mean of its divisors is an integer number (37445596).

Almost surely, 2^74891191 is an apocalyptic number.

74891191 is a deficient number, since it is larger than the sum of its proper divisors (1).

74891191 is an equidigital number, since it uses as much as digits as its factorization.

74891191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 40.

The square root of 74891191 is about 8653.9696671528. The cubic root of 74891191 is about 421.5122938026.

The spelling of 74891191 in words is "seventy-four million, eight hundred ninety-one thousand, one hundred ninety-one".