1131305 has 8 divisors (see below), whose sum is σ = 1551552. Its totient is φ = 775728.

The previous prime is 1131271. The next prime is 1131307. The reversal of 1131305 is 5031311.

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 1131305 - 2⁸ = 1131049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131305.

It is not an unprimeable number, because it can be changed into a prime (1131307) 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, 16127 + ... + 16196.

It is an arithmetic number, because the mean of its divisors is an integer number (193944).

2^1131305 is an apocalyptic number.

It is an amenable number.

1131305 is a deficient number, since it is larger than the sum of its proper divisors (420247).

1131305 is an equidigital number, since it uses as much as digits as its factorization.

1131305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32335.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 1131305 is about 1063.6282245221. The cubic root of 1131305 is about 104.1981245433.

Adding to 1131305 its reverse (5031311), we get a palindrome (6162616).

The spelling of 1131305 in words is "one million, one hundred thirty-one thousand, three hundred five".