1154821 has 2 divisors, whose sum is σ = 1154822. Its totient is φ = 1154820.

The previous prime is 1154819. The next prime is 1154849. The reversal of 1154821 is 1284511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 829921 + 324900 = 911^2 + 570^2 .

It is an emirp because it is prime and its reverse (1284511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1154821 - 2¹ = 1154819 is a prime.

It is a super-2 number, since 2×1154821² = 2667223084082, which contains 22 as substring.

Together with 1154819, 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 = 1154792 and 1154801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1154221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577410 + 577411.

It is an arithmetic number, because the mean of its divisors is an integer number (577411).

2^1154821 is an apocalyptic number.

It is an amenable number.

1154821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154821 is an equidigital number, since it uses as much as digits as its factorization.

1154821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 22.

The square root of 1154821 is about 1074.6259814466. The cubic root of 1154821 is about 104.9151544368.

The spelling of 1154821 in words is "one million, one hundred fifty-four thousand, eight hundred twenty-one".