64502521 has 2 divisors, whose sum is σ = 64502522. Its totient is φ = 64502520.

The previous prime is 64502513. The next prime is 64502551. The reversal of 64502521 is 12520546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55711296 + 8791225 = 7464^2 + 2965^2 .

It is a cyclic number.

It is not a de Polignac number, because 64502521 - 2³ = 64502513 is a prime.

It is not a weakly prime, because it can be changed into another prime (64502551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32251260 + 32251261.

It is an arithmetic number, because the mean of its divisors is an integer number (32251261).

Almost surely, 2^64502521 is an apocalyptic number.

It is an amenable number.

64502521 is a deficient number, since it is larger than the sum of its proper divisors (1).

64502521 is an equidigital number, since it uses as much as digits as its factorization.

64502521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 64502521 is about 8031.3461511754. The cubic root of 64502521 is about 401.0441905434.

The spelling of 64502521 in words is "sixty-four million, five hundred two thousand, five hundred twenty-one".