11213631 has 24 divisors (see below), whose sum is σ = 19031376. Its totient is φ = 6272640.

The previous prime is 11213621. The next prime is 11213639. The reversal of 11213631 is 13631211.

11213631 is a `hidden beast` number, since 11 + 21 + 3 + 631 = 666.

It is not a de Polignac number, because 11213631 - 2⁶ = 11213567 is a prime.

It is a super-2 number, since 2×11213631² = 251491040408322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3070 + ... + 5643.

It is an arithmetic number, because the mean of its divisors is an integer number (792974).

Almost surely, 2^11213631 is an apocalyptic number.

11213631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11213631 is a deficient number, since it is larger than the sum of its proper divisors (7817745).

11213631 is a wasteful number, since it uses less digits than its factorization.

11213631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8743 (or 8740 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 11213631 is about 3348.6760070213. The cubic root of 11213631 is about 223.8285185766.

Adding to 11213631 its reverse (13631211), we get a palindrome (24844842).

The spelling of 11213631 in words is "eleven million, two hundred thirteen thousand, six hundred thirty-one".