1131405 has 16 divisors (see below), whose sum is σ = 1975104. Its totient is φ = 548480.

The previous prime is 1131397. The next prime is 1131413. The reversal of 1131405 is 5041311.

It is an interprime number because it is at equal distance from previous prime (1131397) and next prime (1131413).

It is not a de Polignac number, because 1131405 - 2³ = 1131397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

1131405 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3264 + ... + 3593.

It is an arithmetic number, because the mean of its divisors is an integer number (123444).

2^1131405 is an apocalyptic number.

1131405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131405 is a deficient number, since it is larger than the sum of its proper divisors (843699).

1131405 is a wasteful number, since it uses less digits than its factorization.

1131405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6876.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1131405 is about 1063.6752323900. The cubic root of 1131405 is about 104.2011945983.

Adding to 1131405 its reverse (5041311), we get a palindrome (6172716).

The spelling of 1131405 in words is "one million, one hundred thirty-one thousand, four hundred five".