1166881897 has 2 divisors, whose sum is σ = 1166881898. Its totient is φ = 1166881896.

The previous prime is 1166881883. The next prime is 1166881907. The reversal of 1166881897 is 7981886611.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 903663721 + 263218176 = 30061^2 + 16224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166881897 - 2¹⁵ = 1166849129 is a prime.

It is a super-2 number, since 2×1166881897² = 2723226723092637218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1166881697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583440948 + 583440949.

It is an arithmetic number, because the mean of its divisors is an integer number (583440949).

Almost surely, 2^1166881897 is an apocalyptic number.

It is an amenable number.

1166881897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166881897 is an equidigital number, since it uses as much as digits as its factorization.

1166881897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 55.

The square root of 1166881897 is about 34159.6530573716. The cubic root of 1166881897 is about 1052.7913323994.

The spelling of 1166881897 in words is "one billion, one hundred sixty-six million, eight hundred eighty-one thousand, eight hundred ninety-seven".