1181861285 has 32 divisors (see below), whose sum is σ = 1590067584. Its totient is φ = 835840000.

The previous prime is 1181861281. The next prime is 1181861293. The reversal of 1181861285 is 5821681811.

It is not a de Polignac number, because 1181861285 - 2² = 1181861281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181861281) 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, 903602 + ... + 904908.

It is an arithmetic number, because the mean of its divisors is an integer number (49689612).

Almost surely, 2^1181861285 is an apocalyptic number.

It is an amenable number.

1181861285 is a deficient number, since it is larger than the sum of its proper divisors (408206299).

1181861285 is a wasteful number, since it uses less digits than its factorization.

1181861285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765.

The product of its digits is 30720, while the sum is 41.

The square root of 1181861285 is about 34378.2094501735. The cubic root of 1181861285 is about 1057.2771236772.

The spelling of 1181861285 in words is "one billion, one hundred eighty-one million, eight hundred sixty-one thousand, two hundred eighty-five".