1153721 has 2 divisors, whose sum is σ = 1153722. Its totient is φ = 1153720.

The previous prime is 1153687. The next prime is 1153729. The reversal of 1153721 is 1273511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583696 + 570025 = 764^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1153721 - 2¹⁴ = 1137337 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1153693 and 1153702.

It is not a weakly prime, because it can be changed into another prime (1153729) 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, 576860 + 576861.

It is an arithmetic number, because the mean of its divisors is an integer number (576861).

2^1153721 is an apocalyptic number.

It is an amenable number.

1153721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153721 is an equidigital number, since it uses as much as digits as its factorization.

1153721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 210, while the sum is 20.

The square root of 1153721 is about 1074.1140535344. The cubic root of 1153721 is about 104.8818322937.

Subtracting from 1153721 its product of digits (210), we obtain a palindrome (1153511).

The spelling of 1153721 in words is "one million, one hundred fifty-three thousand, seven hundred twenty-one".