64515331 has 4 divisors (see below), whose sum is σ = 64542352. Its totient is φ = 64488312.

The previous prime is 64515313. The next prime is 64515397. The reversal of 64515331 is 13351546.

64515331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 64515331 - 2⁹ = 64514819 is a prime.

It is a super-2 number, since 2×64515331² = 8324455868079122, which contains 22 as substring.

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 64515331.

It is not an unprimeable number, because it can be changed into a prime (64515301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9540 + ... + 14833.

It is an arithmetic number, because the mean of its divisors is an integer number (16135588).

Almost surely, 2^64515331 is an apocalyptic number.

64515331 is a deficient number, since it is larger than the sum of its proper divisors (27021).

64515331 is a wasteful number, since it uses less digits than its factorization.

64515331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27020.

The product of its digits is 5400, while the sum is 28.

The square root of 64515331 is about 8032.1436117639. The cubic root of 64515331 is about 401.0707374956.

Adding to 64515331 its reverse (13351546), we get a palindrome (77866877).

It can be divided in two parts, 64515 and 331, that added together give a palindrome (64846).

The spelling of 64515331 in words is "sixty-four million, five hundred fifteen thousand, three hundred thirty-one".