1149721 has 4 divisors (see below), whose sum is σ = 1153332. Its totient is φ = 1146112.

The previous prime is 1149689. The next prime is 1149737. The reversal of 1149721 is 1279411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1279411 = 7 ⋅182773.

It can be written as a sum of positive squares in 2 ways, for example, as 746496 + 403225 = 864^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1149721 - 2⁵ = 1149689 is a prime.

It is a Duffinian number.

1149721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1149221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1276 + ... + 1981.

It is an arithmetic number, because the mean of its divisors is an integer number (288333).

2^1149721 is an apocalyptic number.

It is an amenable number.

1149721 is a deficient number, since it is larger than the sum of its proper divisors (3611).

1149721 is an equidigital number, since it uses as much as digits as its factorization.

1149721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610.

The product of its digits is 504, while the sum is 25.

The square root of 1149721 is about 1072.2504371648. The cubic root of 1149721 is about 104.7604820120.

The spelling of 1149721 in words is "one million, one hundred forty-nine thousand, seven hundred twenty-one".