1165087591 has 2 divisors, whose sum is σ = 1165087592. Its totient is φ = 1165087590.

The previous prime is 1165087577. The next prime is 1165087597. The reversal of 1165087591 is 1957805611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1165087591 - 2¹⁵ = 1165054823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165087597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582543795 + 582543796.

It is an arithmetic number, because the mean of its divisors is an integer number (582543796).

Almost surely, 2^1165087591 is an apocalyptic number.

1165087591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165087591 is an equidigital number, since it uses as much as digits as its factorization.

1165087591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 43.

The square root of 1165087591 is about 34133.3794254246. The cubic root of 1165087591 is about 1052.2514323214.

The spelling of 1165087591 in words is "one billion, one hundred sixty-five million, eighty-seven thousand, five hundred ninety-one".