1166570921 has 2 divisors, whose sum is σ = 1166570922. Its totient is φ = 1166570920.

The previous prime is 1166570917. The next prime is 1166570927. The reversal of 1166570921 is 1290756611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 757075225 + 409495696 = 27515^2 + 20236^2 .

It is an emirp because it is prime and its reverse (1290756611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1166570921 - 2² = 1166570917 is a prime.

It is not a weakly prime, because it can be changed into another prime (1166570927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583285460 + 583285461.

It is an arithmetic number, because the mean of its divisors is an integer number (583285461).

Almost surely, 2^1166570921 is an apocalyptic number.

It is an amenable number.

1166570921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166570921 is an equidigital number, since it uses as much as digits as its factorization.

1166570921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 1166570921 is about 34155.1009513952. The cubic root of 1166570921 is about 1052.6978005330.

The spelling of 1166570921 in words is "one billion, one hundred sixty-six million, five hundred seventy thousand, nine hundred twenty-one".