1131815 has 8 divisors (see below), whose sum is σ = 1384128. Its totient is φ = 888160.

The previous prime is 1131799. The next prime is 1131821. The reversal of 1131815 is 5181311.

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

It is not a de Polignac number, because 1131815 - 2⁴ = 1131799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1871 + ... + 2400.

It is an arithmetic number, because the mean of its divisors is an integer number (173016).

2^1131815 is an apocalyptic number.

1131815 is a deficient number, since it is larger than the sum of its proper divisors (252313).

1131815 is an equidigital number, since it uses as much as digits as its factorization.

1131815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4329.

The product of its digits is 120, while the sum is 20.

The square root of 1131815 is about 1063.8679429328. The cubic root of 1131815 is about 104.2137799325.

The spelling of 1131815 in words is "one million, one hundred thirty-one thousand, eight hundred fifteen".