11731213 has 4 divisors (see below), whose sum is σ = 12633628. Its totient is φ = 10828800.

The previous prime is 11731211. The next prime is 11731243. The reversal of 11731213 is 31213711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31213711 = 1277 ⋅24443.

It can be written as a sum of positive squares in 2 ways, for example, as 887364 + 10843849 = 942^2 + 3293^2 .

It is a cyclic number.

It is not a de Polignac number, because 11731213 - 2¹ = 11731211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11731211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451188 + ... + 451213.

It is an arithmetic number, because the mean of its divisors is an integer number (3158407).

Almost surely, 2^11731213 is an apocalyptic number.

11731213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11731213 is a deficient number, since it is larger than the sum of its proper divisors (902415).

11731213 is an equidigital number, since it uses as much as digits as its factorization.

11731213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902414.

The product of its digits is 126, while the sum is 19.

The square root of 11731213 is about 3425.0858383404. The cubic root of 11731213 is about 227.2205674385.

Adding to 11731213 its reverse (31213711), we get a palindrome (42944924).

It can be divided in two parts, 117 and 31213, that multiplied together give a square (3651921 = 1911²).

The spelling of 11731213 in words is "eleven million, seven hundred thirty-one thousand, two hundred thirteen".