63891533 has 2 divisors, whose sum is σ = 63891534. Its totient is φ = 63891532.

The previous prime is 63891521. The next prime is 63891613. The reversal of 63891533 is 33519836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63648484 + 243049 = 7978^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 63891533 - 2¹⁸ = 63629389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63891833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31945766 + 31945767.

It is an arithmetic number, because the mean of its divisors is an integer number (31945767).

Almost surely, 2^63891533 is an apocalyptic number.

It is an amenable number.

63891533 is a deficient number, since it is larger than the sum of its proper divisors (1).

63891533 is an equidigital number, since it uses as much as digits as its factorization.

63891533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 38.

The square root of 63891533 is about 7993.2179377270. The cubic root of 63891533 is about 399.7738993036.

The spelling of 63891533 in words is "sixty-three million, eight hundred ninety-one thousand, five hundred thirty-three".