11531013 has 32 divisors (see below), whose sum is σ = 17415552. Its totient is φ = 6739200.

The previous prime is 11531011. The next prime is 11531017. The reversal of 11531013 is 31013511.

11531013 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11531013 - 2¹ = 11531011 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11530983 and 11531001.

It is a congruent number.

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

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87958 + ... + 88088.

It is an arithmetic number, because the mean of its divisors is an integer number (544236).

Almost surely, 2^11531013 is an apocalyptic number.

11531013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11531013 is a deficient number, since it is larger than the sum of its proper divisors (5884539).

11531013 is a wasteful number, since it uses less digits than its factorization.

11531013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 11531013 is about 3395.7345302600. The cubic root of 11531013 is about 225.9205936608.

Adding to 11531013 its reverse (31013511), we get a palindrome (42544524).

The spelling of 11531013 in words is "eleven million, five hundred thirty-one thousand, thirteen".