1165726489 has 2 divisors, whose sum is σ = 1165726490. Its totient is φ = 1165726488.

The previous prime is 1165726481. The next prime is 1165726613. The reversal of 1165726489 is 9846275611.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1116094464 + 49632025 = 33408^2 + 7045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165726489 - 2³ = 1165726481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165726481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582863244 + 582863245.

It is an arithmetic number, because the mean of its divisors is an integer number (582863245).

Almost surely, 2^1165726489 is an apocalyptic number.

It is an amenable number.

1165726489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165726489 is an equidigital number, since it uses as much as digits as its factorization.

1165726489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 1165726489 is about 34142.7369875351. The cubic root of 1165726489 is about 1052.4437378877.

The spelling of 1165726489 in words is "one billion, one hundred sixty-five million, seven hundred twenty-six thousand, four hundred eighty-nine".