1166649389 has 2 divisors, whose sum is σ = 1166649390. Its totient is φ = 1166649388.

The previous prime is 1166649377. The next prime is 1166649391. The reversal of 1166649389 is 9839466611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 732135364 + 434514025 = 27058^2 + 20845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166649389 - 2⁴ = 1166649373 is a prime.

It is a super-2 number, since 2×1166649389² = 2722141593708146642, which contains 22 as substring.

Together with 1166649391, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1166649389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166649349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583324694 + 583324695.

It is an arithmetic number, because the mean of its divisors is an integer number (583324695).

Almost surely, 2^1166649389 is an apocalyptic number.

It is an amenable number.

1166649389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166649389 is an equidigital number, since it uses as much as digits as its factorization.

1166649389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 53.

The square root of 1166649389 is about 34156.2496331199. The cubic root of 1166649389 is about 1052.7214028239.

The spelling of 1166649389 in words is "one billion, one hundred sixty-six million, six hundred forty-nine thousand, three hundred eighty-nine".