63951521 has 2 divisors, whose sum is σ = 63951522. Its totient is φ = 63951520.

The previous prime is 63951497. The next prime is 63951553. The reversal of 63951521 is 12515936.

It is an a-pointer prime, because the next prime (63951553) can be obtained adding 63951521 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52635025 + 11316496 = 7255^2 + 3364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63951521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63951571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31975760 + 31975761.

It is an arithmetic number, because the mean of its divisors is an integer number (31975761).

Almost surely, 2^63951521 is an apocalyptic number.

It is an amenable number.

63951521 is a deficient number, since it is larger than the sum of its proper divisors (1).

63951521 is an equidigital number, since it uses as much as digits as its factorization.

63951521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 32.

The square root of 63951521 is about 7996.9694885000. The cubic root of 63951521 is about 399.8989765711.

The spelling of 63951521 in words is "sixty-three million, nine hundred fifty-one thousand, five hundred twenty-one".