1166214251 has 4 divisors (see below), whose sum is σ = 1167500952. Its totient is φ = 1164927552.

The previous prime is 1166214239. The next prime is 1166214253. The reversal of 1166214251 is 1524126611.

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 1166214251 - 2¹⁸ = 1165952107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166214253) 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, 641990 + ... + 643803.

It is an arithmetic number, because the mean of its divisors is an integer number (291875238).

Almost surely, 2^1166214251 is an apocalyptic number.

1166214251 is a deficient number, since it is larger than the sum of its proper divisors (1286701).

1166214251 is an equidigital number, since it uses as much as digits as its factorization.

1166214251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286700.

The product of its digits is 2880, while the sum is 29.

The square root of 1166214251 is about 34149.8792237981. The cubic root of 1166214251 is about 1052.5905048714.

The spelling of 1166214251 in words is "one billion, one hundred sixty-six million, two hundred fourteen thousand, two hundred fifty-one".