63667531 has 2 divisors, whose sum is σ = 63667532. Its totient is φ = 63667530.

The previous prime is 63667529. The next prime is 63667553. The reversal of 63667531 is 13576636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63667531 - 2¹ = 63667529 is a prime.

It is a super-2 number, since 2×63667531² = 8107109007271922, which contains 22 as substring.

Together with 63667529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63667501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31833765 + 31833766.

It is an arithmetic number, because the mean of its divisors is an integer number (31833766).

Almost surely, 2^63667531 is an apocalyptic number.

63667531 is a deficient number, since it is larger than the sum of its proper divisors (1).

63667531 is an equidigital number, since it uses as much as digits as its factorization.

63667531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 37.

The square root of 63667531 is about 7979.1936309379. The cubic root of 63667531 is about 399.3061533881.

The spelling of 63667531 in words is "sixty-three million, six hundred sixty-seven thousand, five hundred thirty-one".