11211631 has 4 divisors (see below), whose sum is σ = 11314600. Its totient is φ = 11108664.

The previous prime is 11211623. The next prime is 11211637. The reversal of 11211631 is 13611211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13611211 = 2909 ⋅4679.

It is a cyclic number.

It is not a de Polignac number, because 11211631 - 2³ = 11211623 is a prime.

It is a super-2 number, since 2×11211631² = 251401339360322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211637) 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, 51321 + ... + 51538.

It is an arithmetic number, because the mean of its divisors is an integer number (2828650).

Almost surely, 2^11211631 is an apocalyptic number.

11211631 is a deficient number, since it is larger than the sum of its proper divisors (102969).

11211631 is a wasteful number, since it uses less digits than its factorization.

11211631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102968.

The product of its digits is 36, while the sum is 16.

The square root of 11211631 is about 3348.3773682188. The cubic root of 11211631 is about 223.8152108545.

Adding to 11211631 its reverse (13611211), we get a palindrome (24822842).

The spelling of 11211631 in words is "eleven million, two hundred eleven thousand, six hundred thirty-one".