64196521 has 4 divisors (see below), whose sum is σ = 64251792. Its totient is φ = 64141252.

The previous prime is 64196507. The next prime is 64196527. The reversal of 64196521 is 12569146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64196521 - 2¹⁵ = 64163753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64196527) 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, 25855 + ... + 28228.

It is an arithmetic number, because the mean of its divisors is an integer number (16062948).

Almost surely, 2^64196521 is an apocalyptic number.

It is an amenable number.

64196521 is a deficient number, since it is larger than the sum of its proper divisors (55271).

64196521 is a wasteful number, since it uses less digits than its factorization.

64196521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55270.

The product of its digits is 12960, while the sum is 34.

The square root of 64196521 is about 8012.2731481147. The cubic root of 64196521 is about 400.4090004041.

The spelling of 64196521 in words is "sixty-four million, one hundred ninety-six thousand, five hundred twenty-one".