1177921 has 2 divisors, whose sum is σ = 1177922. Its totient is φ = 1177920.

The previous prime is 1177919. The next prime is 1177933. The reversal of 1177921 is 1297711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 505521 = 820^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1177921 - 2¹ = 1177919 is a prime.

Together with 1177919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1177921.

It is not a weakly prime, because it can be changed into another prime (1177901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 588960 + 588961.

It is an arithmetic number, because the mean of its divisors is an integer number (588961).

2^1177921 is an apocalyptic number.

It is an amenable number.

1177921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1177921 is an equidigital number, since it uses as much as digits as its factorization.

1177921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882, while the sum is 28.

The square root of 1177921 is about 1085.3206899345. The cubic root of 1177921 is about 105.6100840252.

The spelling of 1177921 in words is "one million, one hundred seventy-seven thousand, nine hundred twenty-one".