1166991481 has 2 divisors, whose sum is σ = 1166991482. Its totient is φ = 1166991480.

The previous prime is 1166991409. The next prime is 1166991499. The reversal of 1166991481 is 1841996611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1025024256 + 141967225 = 32016^2 + 11915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166991481 - 2²³ = 1158602873 is a prime.

It is a super-2 number, since 2×1166991481² = 2723738233453146722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1166991281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583495740 + 583495741.

It is an arithmetic number, because the mean of its divisors is an integer number (583495741).

Almost surely, 2^1166991481 is an apocalyptic number.

It is an amenable number.

1166991481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166991481 is an equidigital number, since it uses as much as digits as its factorization.

1166991481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 46.

The square root of 1166991481 is about 34161.2570172703. The cubic root of 1166991481 is about 1052.8242878837.

The spelling of 1166991481 in words is "one billion, one hundred sixty-six million, nine hundred ninety-one thousand, four hundred eighty-one".