64534891 has 2 divisors, whose sum is σ = 64534892. Its totient is φ = 64534890.

The previous prime is 64534853. The next prime is 64534903. The reversal of 64534891 is 19843546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64534891 - 2¹³ = 64526699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64534291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32267445 + 32267446.

It is an arithmetic number, because the mean of its divisors is an integer number (32267446).

Almost surely, 2^64534891 is an apocalyptic number.

64534891 is a deficient number, since it is larger than the sum of its proper divisors (1).

64534891 is an equidigital number, since it uses as much as digits as its factorization.

64534891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 64534891 is about 8033.3611271995. The cubic root of 64534891 is about 401.1112661101. Note that the first 3 decimals are identical.

The spelling of 64534891 in words is "sixty-four million, five hundred thirty-four thousand, eight hundred ninety-one".