64511791 has 2 divisors, whose sum is σ = 64511792. Its totient is φ = 64511790.

The previous prime is 64511767. The next prime is 64511801. The reversal of 64511791 is 19711546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64511791 - 2¹¹ = 64509743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64511731) 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, 32255895 + 32255896.

It is an arithmetic number, because the mean of its divisors is an integer number (32255896).

Almost surely, 2^64511791 is an apocalyptic number.

64511791 is a deficient number, since it is larger than the sum of its proper divisors (1).

64511791 is an equidigital number, since it uses as much as digits as its factorization.

64511791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 64511791 is about 8031.9232441552. The cubic root of 64511791 is about 401.0634016869.

The spelling of 64511791 in words is "sixty-four million, five hundred eleven thousand, seven hundred ninety-one".