1165999117 has 2 divisors, whose sum is σ = 1165999118. Its totient is φ = 1165999116.

The previous prime is 1165999097. The next prime is 1165999127. The reversal of 1165999117 is 7119995611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 732568356 + 433430761 = 27066^2 + 20819^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165999117 - 2⁷ = 1165998989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165999127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582999558 + 582999559.

It is an arithmetic number, because the mean of its divisors is an integer number (582999559).

Almost surely, 2^1165999117 is an apocalyptic number.

It is an amenable number.

1165999117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165999117 is an equidigital number, since it uses as much as digits as its factorization.

1165999117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153090, while the sum is 49.

The square root of 1165999117 is about 34146.7292284342. The cubic root of 1165999117 is about 1052.5257763616.

The spelling of 1165999117 in words is "one billion, one hundred sixty-five million, nine hundred ninety-nine thousand, one hundred seventeen".