64127521 has 2 divisors, whose sum is σ = 64127522. Its totient is φ = 64127520.

The previous prime is 64127501. The next prime is 64127537. The reversal of 64127521 is 12572146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 12503296 = 7185^2 + 3536^2 .

It is a cyclic number.

It is not a de Polignac number, because 64127521 - 2¹³ = 64119329 is a prime.

It is a super-2 number, since 2×64127521² = 8224677899210882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64127521.

It is not a weakly prime, because it can be changed into another prime (64127501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32063760 + 32063761.

It is an arithmetic number, because the mean of its divisors is an integer number (32063761).

Almost surely, 2^64127521 is an apocalyptic number.

It is an amenable number.

64127521 is a deficient number, since it is larger than the sum of its proper divisors (1).

64127521 is an equidigital number, since it uses as much as digits as its factorization.

64127521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 64127521 is about 8007.9660963318. The cubic root of 64127521 is about 400.2654924954.

Adding to 64127521 its reverse (12572146), we get a palindrome (76699667).

The spelling of 64127521 in words is "sixty-four million, one hundred twenty-seven thousand, five hundred twenty-one".