1165831 has 2 divisors, whose sum is σ = 1165832. Its totient is φ = 1165830.

The previous prime is 1165823. The next prime is 1165837. The reversal of 1165831 is 1385611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1165831 - 2³ = 1165823 is a prime.

It is a super-2 number, since 2×1165831² = 2718323841122, which contains 22 as substring.

1165831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1165796 and 1165805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582915 + 582916.

It is an arithmetic number, because the mean of its divisors is an integer number (582916).

2^1165831 is an apocalyptic number.

1165831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165831 is an equidigital number, since it uses as much as digits as its factorization.

1165831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 1165831 is about 1079.7365419397. The cubic root of 1165831 is about 105.2475188564.

The spelling of 1165831 in words is "one million, one hundred sixty-five thousand, eight hundred thirty-one".