997703489 has 2 divisors, whose sum is σ = 997703490. Its totient is φ = 997703488.

The previous prime is 997703461. The next prime is 997703503. The reversal of 997703489 is 984307799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894010000 + 103693489 = 29900^2 + 10183^2 .

It is an emirp because it is prime and its reverse (984307799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997703489 - 2⁸ = 997703233 is a prime.

It is not a weakly prime, because it can be changed into another prime (997703419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498851744 + 498851745.

It is an arithmetic number, because the mean of its divisors is an integer number (498851745).

Almost surely, 2^997703489 is an apocalyptic number.

It is an amenable number.

997703489 is a deficient number, since it is larger than the sum of its proper divisors (1).

997703489 is an equidigital number, since it uses as much as digits as its factorization.

997703489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3429216, while the sum is 56.

The square root of 997703489 is about 31586.4447033850. Note that the first 3 decimals coincide. The cubic root of 997703489 is about 999.2339095887.

The spelling of 997703489 in words is "nine hundred ninety-seven million, seven hundred three thousand, four hundred eighty-nine".