1181813 has 8 divisors (see below), whose sum is σ = 1240320. Its totient is φ = 1124640.

The previous prime is 1181777. The next prime is 1181839. The reversal of 1181813 is 3181811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1181813 - 2¹² = 1177717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1793 + ... + 2361.

It is an arithmetic number, because the mean of its divisors is an integer number (155040).

2^1181813 is an apocalyptic number.

It is an amenable number.

1181813 is a deficient number, since it is larger than the sum of its proper divisors (58507).

1181813 is an equidigital number, since it uses as much as digits as its factorization.

1181813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its digits is 192, while the sum is 23.

The square root of 1181813 is about 1087.1122297169. The cubic root of 1181813 is about 105.7262725112.

The spelling of 1181813 in words is "one million, one hundred eighty-one thousand, eight hundred thirteen".