63405689 has 2 divisors, whose sum is σ = 63405690. Its totient is φ = 63405688.

The previous prime is 63405677. The next prime is 63405731. The reversal of 63405689 is 98650436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57684025 + 5721664 = 7595^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 63405689 - 2⁴ = 63405673 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (63405619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31702844 + 31702845.

It is an arithmetic number, because the mean of its divisors is an integer number (31702845).

Almost surely, 2^63405689 is an apocalyptic number.

It is an amenable number.

63405689 is a deficient number, since it is larger than the sum of its proper divisors (1).

63405689 is an equidigital number, since it uses as much as digits as its factorization.

63405689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 63405689 is about 7962.7689279546. The cubic root of 63405689 is about 398.7579996626.

The spelling of 63405689 in words is "sixty-three million, four hundred five thousand, six hundred eighty-nine".