212311631 has 16 divisors (see below), whose sum is σ = 246604800. Its totient is φ = 179026848.

The previous prime is 212311621. The next prime is 212311633. The reversal of 212311631 is 136113212.

It is a de Polignac number, because none of the positive numbers 2^k-212311631 is a prime.

It is a super-2 number, since 2×212311631² = 90152457315760322, 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 (212311633) 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, 209081 + ... + 210093.

It is an arithmetic number, because the mean of its divisors is an integer number (15412800).

Almost surely, 2^212311631 is an apocalyptic number.

212311631 is a deficient number, since it is larger than the sum of its proper divisors (34293169).

212311631 is a wasteful number, since it uses less digits than its factorization.

212311631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478.

The product of its digits is 216, while the sum is 20.

The square root of 212311631 is about 14570.9173012546. The cubic root of 212311631 is about 596.5652181623.

Adding to 212311631 its reverse (136113212), we get a palindrome (348424843).

The spelling of 212311631 in words is "two hundred twelve million, three hundred eleven thousand, six hundred thirty-one".