1166531 has 2 divisors, whose sum is σ = 1166532. Its totient is φ = 1166530.

The previous prime is 1166527. The next prime is 1166533. The reversal of 1166531 is 1356611.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1356611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1166531 - 2² = 1166527 is a prime.

It is a super-2 number, since 2×1166531² = 2721589147922, which contains 22 as substring.

Together with 1166533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1166497 and 1166506.

It is not a weakly prime, because it can be changed into another prime (1166533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583265 + 583266.

It is an arithmetic number, because the mean of its divisors is an integer number (583266).

2^1166531 is an apocalyptic number.

1166531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166531 is an equidigital number, since it uses as much as digits as its factorization.

1166531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 23.

The square root of 1166531 is about 1080.0606464454. The cubic root of 1166531 is about 105.2685792339.

The spelling of 1166531 in words is "one million, one hundred sixty-six thousand, five hundred thirty-one".