64221523 has 4 divisors (see below), whose sum is σ = 64255680. Its totient is φ = 64187368.

The previous prime is 64221481. The next prime is 64221541. The reversal of 64221523 is 32512246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64221523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64221583) 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, 14083 + ... + 18076.

It is an arithmetic number, because the mean of its divisors is an integer number (16063920).

Almost surely, 2^64221523 is an apocalyptic number.

64221523 is a deficient number, since it is larger than the sum of its proper divisors (34157).

64221523 is a wasteful number, since it uses less digits than its factorization.

64221523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34156.

The product of its digits is 2880, while the sum is 25.

The square root of 64221523 is about 8013.8332276134. The cubic root of 64221523 is about 400.4609748015.

Adding to 64221523 its reverse (32512246), we get a palindrome (96733769).

The spelling of 64221523 in words is "sixty-four million, two hundred twenty-one thousand, five hundred twenty-three".