63641551 has 2 divisors, whose sum is σ = 63641552. Its totient is φ = 63641550.

The previous prime is 63641527. The next prime is 63641579. The reversal of 63641551 is 15514636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63641551 - 2⁷ = 63641423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63641951) 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, 31820775 + 31820776.

It is an arithmetic number, because the mean of its divisors is an integer number (31820776).

Almost surely, 2^63641551 is an apocalyptic number.

63641551 is a deficient number, since it is larger than the sum of its proper divisors (1).

63641551 is an equidigital number, since it uses as much as digits as its factorization.

63641551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 63641551 is about 7977.5654807717. The cubic root of 63641551 is about 399.2518327368.

The spelling of 63641551 in words is "sixty-three million, six hundred forty-one thousand, five hundred fifty-one".