64099591 has 2 divisors, whose sum is σ = 64099592. Its totient is φ = 64099590.

The previous prime is 64099531. The next prime is 64099603. The reversal of 64099591 is 19599046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64099591 - 2¹³ = 64091399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64099531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32049795 + 32049796.

It is an arithmetic number, because the mean of its divisors is an integer number (32049796).

Almost surely, 2^64099591 is an apocalyptic number.

64099591 is a deficient number, since it is larger than the sum of its proper divisors (1).

64099591 is an equidigital number, since it uses as much as digits as its factorization.

64099591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 64099591 is about 8006.2220179058. Note that the first 3 decimals coincide. The cubic root of 64099591 is about 400.2073737218.

The spelling of 64099591 in words is "sixty-four million, ninety-nine thousand, five hundred ninety-one".