1167821 has 2 divisors, whose sum is σ = 1167822. Its totient is φ = 1167820.

The previous prime is 1167811. The next prime is 1167823. The reversal of 1167821 is 1287611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 697225 + 470596 = 835^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1167821 - 2¹⁸ = 905677 is a prime.

Together with 1167823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1167823) 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, 583910 + 583911.

It is an arithmetic number, because the mean of its divisors is an integer number (583911).

2^1167821 is an apocalyptic number.

It is an amenable number.

1167821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1167821 is an equidigital number, since it uses as much as digits as its factorization.

1167821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 26.

The square root of 1167821 is about 1080.6576701250. The cubic root of 1167821 is about 105.3073684421.

It can be divided in two parts, 11 and 67821, that multiplied together give a triangular number (746031 = T₁₂₂₁).

The spelling of 1167821 in words is "one million, one hundred sixty-seven thousand, eight hundred twenty-one".