64223191 has 2 divisors, whose sum is σ = 64223192. Its totient is φ = 64223190.

The previous prime is 64223189. The next prime is 64223207. The reversal of 64223191 is 19132246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64223191 - 2¹ = 64223189 is a prime.

Together with 64223189, 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 (64223111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32111595 + 32111596.

It is an arithmetic number, because the mean of its divisors is an integer number (32111596).

Almost surely, 2^64223191 is an apocalyptic number.

64223191 is a deficient number, since it is larger than the sum of its proper divisors (1).

64223191 is an equidigital number, since it uses as much as digits as its factorization.

64223191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 64223191 is about 8013.9372969845. The cubic root of 64223191 is about 400.4644417759.

The spelling of 64223191 in words is "sixty-four million, two hundred twenty-three thousand, one hundred ninety-one".