11570981 has 4 divisors (see below), whose sum is σ = 12180000. Its totient is φ = 10961964.

The previous prime is 11570969. The next prime is 11570983. The reversal of 11570981 is 18907511.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11570981 is a prime.

It is a super-2 number, since 2×11570981² = 267775202604722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11570983) 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 in 3 ways as a sum of consecutive naturals, for example, 304481 + ... + 304518.

It is an arithmetic number, because the mean of its divisors is an integer number (3045000).

Almost surely, 2^11570981 is an apocalyptic number.

It is an amenable number.

11570981 is a deficient number, since it is larger than the sum of its proper divisors (609019).

11570981 is an equidigital number, since it uses as much as digits as its factorization.

11570981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609018.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 11570981 is about 3401.6144696306. The cubic root of 11570981 is about 226.1813161069.

The spelling of 11570981 in words is "eleven million, five hundred seventy thousand, nine hundred eighty-one".