1160505991 has 4 divisors (see below), whose sum is σ = 1160621032. Its totient is φ = 1160390952.

The previous prime is 1160505961. The next prime is 1160506001. The reversal of 1160505991 is 1995050611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1160505991 - 2¹³ = 1160497799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1160505991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1160505961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40761 + ... + 63106.

It is an arithmetic number, because the mean of its divisors is an integer number (290155258).

Almost surely, 2^1160505991 is an apocalyptic number.

1160505991 is a deficient number, since it is larger than the sum of its proper divisors (115041).

1160505991 is a wasteful number, since it uses less digits than its factorization.

1160505991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115040.

The product of its (nonzero) digits is 12150, while the sum is 37.

The square root of 1160505991 is about 34066.2001256377. The cubic root of 1160505991 is about 1050.8703263241.

The spelling of 1160505991 in words is "one billion, one hundred sixty million, five hundred five thousand, nine hundred ninety-one".