997126589 has 2 divisors, whose sum is σ = 997126590. Its totient is φ = 997126588.

The previous prime is 997126561. The next prime is 997126591. The reversal of 997126589 is 985621799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 868304089 + 128822500 = 29467^2 + 11350^2 .

It is a cyclic number.

It is not a de Polignac number, because 997126589 - 2¹⁶ = 997061053 is a prime.

It is a super-2 number, since 2×997126589² = 1988522868981549842, which contains 22 as substring.

Together with 997126591, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997126549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498563294 + 498563295.

It is an arithmetic number, because the mean of its divisors is an integer number (498563295).

Almost surely, 2^997126589 is an apocalyptic number.

It is an amenable number.

997126589 is a deficient number, since it is larger than the sum of its proper divisors (1).

997126589 is an equidigital number, since it uses as much as digits as its factorization.

997126589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 56.

The square root of 997126589 is about 31577.3113009958. The cubic root of 997126589 is about 999.0412774782.

The spelling of 997126589 in words is "nine hundred ninety-seven million, one hundred twenty-six thousand, five hundred eighty-nine".