11570721 has 4 divisors (see below), whose sum is σ = 15427632. Its totient is φ = 7713812.

The previous prime is 11570653. The next prime is 11570729. The reversal of 11570721 is 12707511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12707511 = 3 ⋅4235837.

It is a cyclic number.

It is not a de Polignac number, because 11570721 - 2⁷ = 11570593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11570691 and 11570700.

It is not an unprimeable number, because it can be changed into a prime (11570729) 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, 1928451 + ... + 1928456.

It is an arithmetic number, because the mean of its divisors is an integer number (3856908).

Almost surely, 2^11570721 is an apocalyptic number.

It is an amenable number.

11570721 is a deficient number, since it is larger than the sum of its proper divisors (3856911).

11570721 is an equidigital number, since it uses as much as digits as its factorization.

11570721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856910.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 11570721 is about 3401.5762522689. The cubic root of 11570721 is about 226.1796219958.

The spelling of 11570721 in words is "eleven million, five hundred seventy thousand, seven hundred twenty-one".