17897021489 has 2 divisors, whose sum is σ = 17897021490. Its totient is φ = 17897021488.

The previous prime is 17897021447. The next prime is 17897021497. The reversal of 17897021489 is 98412079871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14180046400 + 3716975089 = 119080^2 + 60967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17897021489 is a prime.

It is not a weakly prime, because it can be changed into another prime (17897021089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8948510744 + 8948510745.

It is an arithmetic number, because the mean of its divisors is an integer number (8948510745).

Almost surely, 2^17897021489 is an apocalyptic number.

It is an amenable number.

17897021489 is a deficient number, since it is larger than the sum of its proper divisors (1).

17897021489 is an equidigital number, since it uses as much as digits as its factorization.

17897021489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The spelling of 17897021489 in words is "seventeen billion, eight hundred ninety-seven million, twenty-one thousand, four hundred eighty-nine".