64511191 has 2 divisors, whose sum is σ = 64511192. Its totient is φ = 64511190.

The previous prime is 64511173. The next prime is 64511197. The reversal of 64511191 is 19111546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64511191 - 2⁹ = 64510679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64511197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32255595 + 32255596.

It is an arithmetic number, because the mean of its divisors is an integer number (32255596).

Almost surely, 2^64511191 is an apocalyptic number.

64511191 is a deficient number, since it is larger than the sum of its proper divisors (1).

64511191 is an equidigital number, since it uses as much as digits as its factorization.

64511191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The square root of 64511191 is about 8031.8858931138. The cubic root of 64511191 is about 401.0621583029.

The spelling of 64511191 in words is "sixty-four million, five hundred eleven thousand, one hundred ninety-one".