63983509 has 2 divisors, whose sum is σ = 63983510. Its totient is φ = 63983508.

The previous prime is 63983503. The next prime is 63983519. The reversal of 63983509 is 90538936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50367409 + 13616100 = 7097^2 + 3690^2 .

It is a cyclic number.

It is not a de Polignac number, because 63983509 - 2³ = 63983501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63983501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31991754 + 31991755.

It is an arithmetic number, because the mean of its divisors is an integer number (31991755).

Almost surely, 2^63983509 is an apocalyptic number.

It is an amenable number.

63983509 is a deficient number, since it is larger than the sum of its proper divisors (1).

63983509 is an equidigital number, since it uses as much as digits as its factorization.

63983509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 63983509 is about 7998.9692460966. The cubic root of 63983509 is about 399.9656407987.

It can be divided in two parts, 639 and 83509, that added together give a palindrome (84148).

The spelling of 63983509 in words is "sixty-three million, nine hundred eighty-three thousand, five hundred nine".