11531001 has 16 divisors (see below), whose sum is σ = 15681600. Its totient is φ = 7535808.

The previous prime is 11530999. The next prime is 11531011. The reversal of 11531001 is 10013511.

It is not a de Polignac number, because 11531001 - 2¹ = 11530999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11531011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58435 + ... + 58631.

It is an arithmetic number, because the mean of its divisors is an integer number (980100).

Almost surely, 2^11531001 is an apocalyptic number.

It is an amenable number.

11531001 is a deficient number, since it is larger than the sum of its proper divisors (4150599).

11531001 is a wasteful number, since it uses less digits than its factorization.

11531001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488.

The product of its (nonzero) digits is 15, while the sum is 12.

The square root of 11531001 is about 3395.7327633370. The cubic root of 11531001 is about 225.9205152911.

Adding to 11531001 its reverse (10013511), we get a palindrome (21544512).

The spelling of 11531001 in words is "eleven million, five hundred thirty-one thousand, one".