6421589897 has 2 divisors, whose sum is σ = 6421589898. Its totient is φ = 6421589896.

The previous prime is 6421589851. The next prime is 6421589939. The reversal of 6421589897 is 7989851246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5371570681 + 1050019216 = 73291^2 + 32404^2 .

It is a cyclic number.

It is not a de Polignac number, because 6421589897 - 2⁸ = 6421589641 is a prime.

It is not a weakly prime, because it can be changed into another prime (6421583897) 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, 3210794948 + 3210794949.

It is an arithmetic number, because the mean of its divisors is an integer number (3210794949).

Almost surely, 2^6421589897 is an apocalyptic number.

It is an amenable number.

6421589897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421589897 is an equidigital number, since it uses as much as digits as its factorization.

6421589897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 59.

The square root of 6421589897 is about 80134.8232480736. The cubic root of 6421589897 is about 1858.7209282456.

The spelling of 6421589897 in words is "six billion, four hundred twenty-one million, five hundred eighty-nine thousand, eight hundred ninety-seven".