11709491 has 4 divisors (see below), whose sum is σ = 12325800. Its totient is φ = 11093184.

The previous prime is 11709487. The next prime is 11709517. The reversal of 11709491 is 19490711.

It is a happy number.

11709491 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19490711 = 1229 ⋅15859.

It is a cyclic number.

It is not a de Polignac number, because 11709491 - 2² = 11709487 is a prime.

It is a super-2 number, since 2×11709491² = 274224358958162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11709421) 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, 308126 + ... + 308163.

It is an arithmetic number, because the mean of its divisors is an integer number (3081450).

Almost surely, 2^11709491 is an apocalyptic number.

11709491 is a deficient number, since it is larger than the sum of its proper divisors (616309).

11709491 is an equidigital number, since it uses as much as digits as its factorization.

11709491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616308.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 11709491 is about 3421.9133536663. The cubic root of 11709491 is about 227.0802371170.

The spelling of 11709491 in words is "eleven million, seven hundred nine thousand, four hundred ninety-one".