64518231 has 8 divisors (see below), whose sum is σ = 86400880. Its totient is φ = 42823872.

The previous prime is 64518191. The next prime is 64518239. The reversal of 64518231 is 13281546.

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

It is a de Polignac number, because none of the positive numbers 2^k-64518231 is a prime.

It is a super-2 number, since 2×64518231² = 8325204262738722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64518239) 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, 46270 + ... + 47643.

It is an arithmetic number, because the mean of its divisors is an integer number (10800110).

Almost surely, 2^64518231 is an apocalyptic number.

64518231 is a deficient number, since it is larger than the sum of its proper divisors (21882649).

64518231 is a wasteful number, since it uses less digits than its factorization.

64518231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94145.

The product of its digits is 5760, while the sum is 30.

The square root of 64518231 is about 8032.3241343960. The cubic root of 64518231 is about 401.0767468564.

Adding to 64518231 its reverse (13281546), we get a palindrome (77799777).

The spelling of 64518231 in words is "sixty-four million, five hundred eighteen thousand, two hundred thirty-one".