64591133 has 4 divisors (see below), whose sum is σ = 64859388. Its totient is φ = 64322880.

The previous prime is 64591129. The next prime is 64591141. The reversal of 64591133 is 33119546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45738169 + 18852964 = 6763^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 64591133 - 2² = 64591129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64591133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64591103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133766 + ... + 134247.

It is an arithmetic number, because the mean of its divisors is an integer number (16214847).

Almost surely, 2^64591133 is an apocalyptic number.

It is an amenable number.

64591133 is a deficient number, since it is larger than the sum of its proper divisors (268255).

64591133 is a wasteful number, since it uses less digits than its factorization.

64591133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268254.

The product of its digits is 9720, while the sum is 32.

The square root of 64591133 is about 8036.8608921643. The cubic root of 64591133 is about 401.2277547733.

The spelling of 64591133 in words is "sixty-four million, five hundred ninety-one thousand, one hundred thirty-three".