64394191 has 2 divisors, whose sum is σ = 64394192. Its totient is φ = 64394190.

The previous prime is 64394167. The next prime is 64394201. The reversal of 64394191 is 19149346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64394191 - 2⁷ = 64394063 is a prime.

It is a super-2 number, since 2×64394191² = 8293223669088962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64394191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64394111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32197095 + 32197096.

It is an arithmetic number, because the mean of its divisors is an integer number (32197096).

Almost surely, 2^64394191 is an apocalyptic number.

64394191 is a deficient number, since it is larger than the sum of its proper divisors (1).

64394191 is an equidigital number, since it uses as much as digits as its factorization.

64394191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 64394191 is about 8024.5991177130. The cubic root of 64394191 is about 400.8195509438.

The spelling of 64394191 in words is "sixty-four million, three hundred ninety-four thousand, one hundred ninety-one".