1129831 has 2 divisors, whose sum is σ = 1129832. Its totient is φ = 1129830.

The previous prime is 1129819. The next prime is 1129841. The reversal of 1129831 is 1389211.

It is a strong prime.

It is an emirp because it is prime and its reverse (1389211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1129831 - 2¹⁷ = 998759 is a prime.

It is a super-2 number, since 2×1129831² = 2553036177122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1129796 and 1129805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1129841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564915 + 564916.

It is an arithmetic number, because the mean of its divisors is an integer number (564916).

2^1129831 is an apocalyptic number.

1129831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129831 is an equidigital number, since it uses as much as digits as its factorization.

1129831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 25.

The square root of 1129831 is about 1062.9350873877. The cubic root of 1129831 is about 104.1528509321.

The spelling of 1129831 in words is "one million, one hundred twenty-nine thousand, eight hundred thirty-one".