64521427 has 2 divisors, whose sum is σ = 64521428. Its totient is φ = 64521426.

The previous prime is 64521419. The next prime is 64521449. The reversal of 64521427 is 72412546.

64521427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64521427 - 2³ = 64521419 is a prime.

It is not a weakly prime, because it can be changed into another prime (64521467) 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 as a sum of consecutive naturals, namely, 32260713 + 32260714.

It is an arithmetic number, because the mean of its divisors is an integer number (32260714).

Almost surely, 2^64521427 is an apocalyptic number.

64521427 is a deficient number, since it is larger than the sum of its proper divisors (1).

64521427 is an equidigital number, since it uses as much as digits as its factorization.

64521427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 31.

The square root of 64521427 is about 8032.5230780870. The cubic root of 64521427 is about 401.0833693779.

The spelling of 64521427 in words is "sixty-four million, five hundred twenty-one thousand, four hundred twenty-seven".