11257691 has 4 divisors (see below), whose sum is σ = 11264592. Its totient is φ = 11250792.

The previous prime is 11257679. The next prime is 11257711. The reversal of 11257691 is 19675211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 19675211 = 631 ⋅31181.

It is a cyclic number.

It is not a de Polignac number, because 11257691 - 2⁶ = 11257627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11257651) 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, 521 + ... + 4773.

It is an arithmetic number, because the mean of its divisors is an integer number (2816148).

Almost surely, 2^11257691 is an apocalyptic number.

11257691 is a deficient number, since it is larger than the sum of its proper divisors (6901).

11257691 is an equidigital number, since it uses as much as digits as its factorization.

11257691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900.

The product of its digits is 3780, while the sum is 32.

The square root of 11257691 is about 3355.2482769536. The cubic root of 11257691 is about 224.1212871540.

The spelling of 11257691 in words is "eleven million, two hundred fifty-seven thousand, six hundred ninety-one".