11181257 has 6 divisors (see below), whose sum is σ = 11853594. Its totient is φ = 10510560.

The previous prime is 11181241. The next prime is 11181263. The reversal of 11181257 is 75218111.

11181257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10523536 + 657721 = 3244^2 + 811^2 .

It is not a de Polignac number, because 11181257 - 2⁴ = 11181241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11181277) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13382 + ... + 14192.

It is an arithmetic number, because the mean of its divisors is an integer number (1975599).

Almost surely, 2^11181257 is an apocalyptic number.

11181257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11181257 is a deficient number, since it is larger than the sum of its proper divisors (672337).

11181257 is an frugal number, since it uses more digits than its factorization.

11181257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 828 counting only the distinct ones).

The product of its digits is 560, while the sum is 26.

The square root of 11181257 is about 3343.8386623759. The cubic root of 11181257 is about 223.6129116661.

Adding to 11181257 its reverse (75218111), we get a palindrome (86399368).

It can be divided in two parts, 1118 and 1257, that multiplied together give a triangular number (1405326 = T₁₆₇₆).

The spelling of 11181257 in words is "eleven million, one hundred eighty-one thousand, two hundred fifty-seven".