64511321 has 8 divisors (see below), whose sum is σ = 74661120. Its totient is φ = 54595008.

The previous prime is 64511303. The next prime is 64511329. The reversal of 64511321 is 12311546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64511321 is a prime.

It is a super-3 number, since 3×64511321³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64511329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57776 + ... + 58881.

It is an arithmetic number, because the mean of its divisors is an integer number (9332640).

Almost surely, 2^64511321 is an apocalyptic number.

It is an amenable number.

64511321 is a deficient number, since it is larger than the sum of its proper divisors (10149799).

64511321 is a wasteful number, since it uses less digits than its factorization.

64511321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116743.

The product of its digits is 720, while the sum is 23.

The square root of 64511321 is about 8031.8939858541. The cubic root of 64511321 is about 401.0624277034.

Adding to 64511321 its reverse (12311546), we get a palindrome (76822867).

The spelling of 64511321 in words is "sixty-four million, five hundred eleven thousand, three hundred twenty-one".