1165531 has 2 divisors, whose sum is σ = 1165532. Its totient is φ = 1165530.

The previous prime is 1165529. The next prime is 1165579. The reversal of 1165531 is 1355611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1165531 - 2¹ = 1165529 is a prime.

It is a super-2 number, since 2×1165531² = 2716925023922, which contains 22 as substring.

Together with 1165529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1165511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582765 + 582766.

It is an arithmetic number, because the mean of its divisors is an integer number (582766).

2^1165531 is an apocalyptic number.

1165531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165531 is an equidigital number, since it uses as much as digits as its factorization.

1165531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 450, while the sum is 22.

The square root of 1165531 is about 1079.5976102234. The cubic root of 1165531 is about 105.2384903997.

The spelling of 1165531 in words is "one million, one hundred sixty-five thousand, five hundred thirty-one".