63543691 has 2 divisors, whose sum is σ = 63543692. Its totient is φ = 63543690.

The previous prime is 63543677. The next prime is 63543703. The reversal of 63543691 is 19634536.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63543691 - 2⁵ = 63543659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63543691.

It is not a weakly prime, because it can be changed into another prime (63543091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31771845 + 31771846.

It is an arithmetic number, because the mean of its divisors is an integer number (31771846).

Almost surely, 2^63543691 is an apocalyptic number.

63543691 is a deficient number, since it is larger than the sum of its proper divisors (1).

63543691 is an equidigital number, since it uses as much as digits as its factorization.

63543691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 37.

The square root of 63543691 is about 7971.4296710189. The cubic root of 63543691 is about 399.0470879492.

The spelling of 63543691 in words is "sixty-three million, five hundred forty-three thousand, six hundred ninety-one".