11921009 has 8 divisors (see below), whose sum is σ = 12253920. Its totient is φ = 11592576.

The previous prime is 11920991. The next prime is 11921017. The reversal of 11921009 is 90012911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11921009 is a prime.

It is a super-2 number, since 2×11921009² = 284220911156162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11921069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4682 + ... + 6764.

It is an arithmetic number, because the mean of its divisors is an integer number (1531740).

Almost surely, 2^11921009 is an apocalyptic number.

It is an amenable number.

11921009 is a deficient number, since it is larger than the sum of its proper divisors (332911).

11921009 is an equidigital number, since it uses as much as digits as its factorization.

11921009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 11921009 is about 3452.6814217359. The cubic root of 11921009 is about 228.4393970928.

The spelling of 11921009 in words is "eleven million, nine hundred twenty-one thousand, nine".