212031531 has 12 divisors (see below), whose sum is σ = 324283752. Its totient is φ = 133039296.

The previous prime is 212031529. The next prime is 212031563. The reversal of 212031531 is 135130212.

It is not a de Polignac number, because 212031531 - 2¹ = 212031529 is a prime.

It is a super-2 number, since 2×212031531² = 89914740276407922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212031511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 692761 + ... + 693066.

It is an arithmetic number, because the mean of its divisors is an integer number (27023646).

Almost surely, 2^212031531 is an apocalyptic number.

212031531 is a deficient number, since it is larger than the sum of its proper divisors (112252221).

212031531 is a wasteful number, since it uses less digits than its factorization.

212031531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385850 (or 1385847 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 212031531 is about 14561.3025172888. The cubic root of 212031531 is about 596.3027557714.

Adding to 212031531 its reverse (135130212), we get a palindrome (347161743).

The spelling of 212031531 in words is "two hundred twelve million, thirty-one thousand, five hundred thirty-one".