212255631 has 24 divisors (see below), whose sum is σ = 368833920. Its totient is φ = 114904656.

The previous prime is 212255621. The next prime is 212255657. The reversal of 212255631 is 136552212.

It is a happy number.

212255631 is a `hidden beast` number, since 2 + 1 + 2 + 25 + 5 + 631 = 666.

It is not a de Polignac number, because 212255631 - 2¹¹ = 212253583 is a prime.

It is a super-2 number, since 2×212255631² = 90104905782416322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212255595 and 212255604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212255621) 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, 87465 + ... + 89858.

It is an arithmetic number, because the mean of its divisors is an integer number (15368080).

Almost surely, 2^212255631 is an apocalyptic number.

212255631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212255631 is a deficient number, since it is larger than the sum of its proper divisors (156578289).

212255631 is a wasteful number, since it uses less digits than its factorization.

212255631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177355 (or 177352 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 212255631 is about 14568.9955384714. The cubic root of 212255631 is about 596.5127628953.

The spelling of 212255631 in words is "two hundred twelve million, two hundred fifty-five thousand, six hundred thirty-one".