1180233661 has 4 divisors (see below), whose sum is σ = 1231548192. Its totient is φ = 1128919132.

The previous prime is 1180233641. The next prime is 1180233683. The reversal of 1180233661 is 1663320811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1180233661 - 2⁷ = 1180233533 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1180233601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25657231 + ... + 25657276.

It is an arithmetic number, because the mean of its divisors is an integer number (307887048).

Almost surely, 2^1180233661 is an apocalyptic number.

It is an amenable number.

1180233661 is a deficient number, since it is larger than the sum of its proper divisors (51314531).

1180233661 is an equidigital number, since it uses as much as digits as its factorization.

1180233661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51314530.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1180233661 is about 34354.5289736302. The cubic root of 1180233661 is about 1056.7915505632.

The spelling of 1180233661 in words is "one billion, one hundred eighty million, two hundred thirty-three thousand, six hundred sixty-one".