1166143251 has 16 divisors (see below), whose sum is σ = 1913671424. Its totient is φ = 615108384.

The previous prime is 1166143247. The next prime is 1166143313. The reversal of 1166143251 is 1523416611.

It is a happy number.

It is not a de Polignac number, because 1166143251 - 2² = 1166143247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1166143211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2135521 + ... + 2136066.

It is an arithmetic number, because the mean of its divisors is an integer number (119604464).

Almost surely, 2^1166143251 is an apocalyptic number.

1166143251 is a deficient number, since it is larger than the sum of its proper divisors (747528173).

1166143251 is a wasteful number, since it uses less digits than its factorization.

1166143251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271610.

The product of its digits is 4320, while the sum is 30.

The square root of 1166143251 is about 34148.8396728205. The cubic root of 1166143251 is about 1052.5691436042.

Adding to 1166143251 its reverse (1523416611), we get a palindrome (2689559862).

The spelling of 1166143251 in words is "one billion, one hundred sixty-six million, one hundred forty-three thousand, two hundred fifty-one".