1166261247 has 12 divisors (see below), whose sum is σ = 1746992520. Its totient is φ = 777507336.

The previous prime is 1166261231. The next prime is 1166261267. The reversal of 1166261247 is 7421626611.

1166261247 is a `hidden beast` number, since 1 + 1 + 6 + 626 + 1 + 24 + 7 = 666.

It is not a de Polignac number, because 1166261247 - 2⁴ = 1166261231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166261267) 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, 2399472 + ... + 2399957.

It is an arithmetic number, because the mean of its divisors is an integer number (145582710).

Almost surely, 2^1166261247 is an apocalyptic number.

1166261247 is a deficient number, since it is larger than the sum of its proper divisors (580731273).

1166261247 is an frugal number, since it uses more digits than its factorization.

1166261247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4799444 (or 4799432 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1166261247 is about 34150.5673012909. The cubic root of 1166261247 is about 1052.6046437482.

Adding to 1166261247 its reverse (7421626611), we get a palindrome (8587887858).

The spelling of 1166261247 in words is "one billion, one hundred sixty-six million, two hundred sixty-one thousand, two hundred forty-seven".