11721157 has 8 divisors (see below), whose sum is σ = 14100800. Its totient is φ = 9517824.

The previous prime is 11721139. The next prime is 11721163. The reversal of 11721157 is 75112711.

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

It is a cyclic number.

It is not a de Polignac number, because 11721157 - 2⁷ = 11721029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721107) 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 7 ways as a sum of consecutive naturals, for example, 43932 + ... + 44197.

It is an arithmetic number, because the mean of its divisors is an integer number (1762600).

Almost surely, 2^11721157 is an apocalyptic number.

It is an amenable number.

11721157 is a deficient number, since it is larger than the sum of its proper divisors (2379643).

11721157 is an equidigital number, since it uses as much as digits as its factorization.

11721157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88155.

The product of its digits is 490, while the sum is 25.

The square root of 11721157 is about 3423.6175312088. The cubic root of 11721157 is about 227.1556243612.

Adding to 11721157 its reverse (75112711), we get a palindrome (86833868).

The spelling of 11721157 in words is "eleven million, seven hundred twenty-one thousand, one hundred fifty-seven".