11391657 has 4 divisors (see below), whose sum is σ = 15188880. Its totient is φ = 7594436.

The previous prime is 11391641. The next prime is 11391673. The reversal of 11391657 is 75619311.

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.

It is an interprime number because it is at equal distance from previous prime (11391641) and next prime (11391673).

It is a cyclic number.

It is not a de Polignac number, because 11391657 - 2⁴ = 11391641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11391607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1898607 + ... + 1898612.

It is an arithmetic number, because the mean of its divisors is an integer number (3797220).

Almost surely, 2^11391657 is an apocalyptic number.

It is an amenable number.

11391657 is a deficient number, since it is larger than the sum of its proper divisors (3797223).

11391657 is an equidigital number, since it uses as much as digits as its factorization.

11391657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797222.

The product of its digits is 5670, while the sum is 33.

The square root of 11391657 is about 3375.1528854261. The cubic root of 11391657 is about 225.0067948565.

The spelling of 11391657 in words is "eleven million, three hundred ninety-one thousand, six hundred fifty-seven".