1166311251 has 32 divisors (see below), whose sum is σ = 2016737280. Its totient is φ = 652278528.

The previous prime is 1166311247. The next prime is 1166311253. The reversal of 1166311251 is 1521136611.

1166311251 is a `hidden beast` number, since 1 + 1 + 6 + 631 + 1 + 25 + 1 = 666.

It is not a de Polignac number, because 1166311251 - 2² = 1166311247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1166311253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56766 + ... + 74531.

It is an arithmetic number, because the mean of its divisors is an integer number (63023040).

Almost surely, 2^1166311251 is an apocalyptic number.

1166311251 is a deficient number, since it is larger than the sum of its proper divisors (850426029).

1166311251 is a wasteful number, since it uses less digits than its factorization.

1166311251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131360 (or 131354 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 1166311251 is about 34151.2994042686. The cubic root of 1166311251 is about 1052.6196871731.

Adding to 1166311251 its reverse (1521136611), we get a palindrome (2687447862).

The spelling of 1166311251 in words is "one billion, one hundred sixty-six million, three hundred eleven thousand, two hundred fifty-one".