1170821745 has 12 divisors (see below), whose sum is σ = 2029424436. Its totient is φ = 624438240.

The previous prime is 1170821711. The next prime is 1170821749. The reversal of 1170821745 is 5471280711.

It can be written as a sum of positive squares in 2 ways, for example, as 178382736 + 992439009 = 13356^2 + 31503^2 .

It is not a de Polignac number, because 1170821745 - 2¹⁷ = 1170690673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1170821749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13009086 + ... + 13009175.

It is an arithmetic number, because the mean of its divisors is an integer number (169118703).

Almost surely, 2^1170821745 is an apocalyptic number.

1170821745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1170821745 is a deficient number, since it is larger than the sum of its proper divisors (858602691).

1170821745 is a wasteful number, since it uses less digits than its factorization.

1170821745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26018272 (or 26018269 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The square root of 1170821745 is about 34217.2726119426. The cubic root of 1170821745 is about 1053.9748792902.

The spelling of 1170821745 in words is "one billion, one hundred seventy million, eight hundred twenty-one thousand, seven hundred forty-five".