1159721 has 2 divisors, whose sum is σ = 1159722. Its totient is φ = 1159720.

The previous prime is 1159709. The next prime is 1159777. The reversal of 1159721 is 1279511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 4096 = 1075^2 + 64^2 .

It is an emirp because it is prime and its reverse (1279511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1159721 - 2¹⁸ = 897577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1159421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579860 + 579861.

It is an arithmetic number, because the mean of its divisors is an integer number (579861).

2^1159721 is an apocalyptic number.

It is an amenable number.

1159721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1159721 is an equidigital number, since it uses as much as digits as its factorization.

1159721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 26.

The square root of 1159721 is about 1076.9034311395. The cubic root of 1159721 is about 105.0633329180.

The spelling of 1159721 in words is "one million, one hundred fifty-nine thousand, seven hundred twenty-one".