1178921 has 2 divisors, whose sum is σ = 1178922. Its totient is φ = 1178920.

The previous prime is 1178909. The next prime is 1178927. The reversal of 1178921 is 1298711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1073296 + 105625 = 1036^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1178921 - 2¹⁴ = 1162537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1178927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 589460 + 589461.

It is an arithmetic number, because the mean of its divisors is an integer number (589461).

2^1178921 is an apocalyptic number.

It is an amenable number.

1178921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1178921 is an equidigital number, since it uses as much as digits as its factorization.

1178921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 29.

The square root of 1178921 is about 1085.7812855267. The cubic root of 1178921 is about 105.6399615840.

The spelling of 1178921 in words is "one million, one hundred seventy-eight thousand, nine hundred twenty-one".