64532521 has 2 divisors, whose sum is σ = 64532522. Its totient is φ = 64532520.

The previous prime is 64532519. The next prime is 64532537. The reversal of 64532521 is 12523546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 2359296 = 7885^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 64532521 - 2¹ = 64532519 is a prime.

Together with 64532519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64532521.

It is not a weakly prime, because it can be changed into another prime (64532581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32266260 + 32266261.

It is an arithmetic number, because the mean of its divisors is an integer number (32266261).

Almost surely, 2^64532521 is an apocalyptic number.

It is an amenable number.

64532521 is a deficient number, since it is larger than the sum of its proper divisors (1).

64532521 is an equidigital number, since it uses as much as digits as its factorization.

64532521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 28.

The square root of 64532521 is about 8033.2136159821. The cubic root of 64532521 is about 401.1063558705.

The spelling of 64532521 in words is "sixty-four million, five hundred thirty-two thousand, five hundred twenty-one".