63897989 has 2 divisors, whose sum is σ = 63897990. Its totient is φ = 63897988.

The previous prime is 63897959. The next prime is 63898031. The reversal of 63897989 is 98979836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48413764 + 15484225 = 6958^2 + 3935^2 .

It is a cyclic number.

It is not a de Polignac number, because 63897989 - 2¹⁶ = 63832453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63897929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31948994 + 31948995.

It is an arithmetic number, because the mean of its divisors is an integer number (31948995).

Almost surely, 2^63897989 is an apocalyptic number.

It is an amenable number.

63897989 is a deficient number, since it is larger than the sum of its proper divisors (1).

63897989 is an equidigital number, since it uses as much as digits as its factorization.

63897989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 59.

The square root of 63897989 is about 7993.6217698863. The cubic root of 63897989 is about 399.7873640683.

The spelling of 63897989 in words is "sixty-three million, eight hundred ninety-seven thousand, nine hundred eighty-nine".