63945391 has 2 divisors, whose sum is σ = 63945392. Its totient is φ = 63945390.

The previous prime is 63945383. The next prime is 63945433. The reversal of 63945391 is 19354936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63945391 - 2³ = 63945383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63945311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31972695 + 31972696.

It is an arithmetic number, because the mean of its divisors is an integer number (31972696).

Almost surely, 2^63945391 is an apocalyptic number.

63945391 is a deficient number, since it is larger than the sum of its proper divisors (1).

63945391 is an equidigital number, since it uses as much as digits as its factorization.

63945391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 40.

The square root of 63945391 is about 7996.5862091270. The cubic root of 63945391 is about 399.8861988763.

The spelling of 63945391 in words is "sixty-three million, nine hundred forty-five thousand, three hundred ninety-one".