212531831 has 2 divisors, whose sum is σ = 212531832. Its totient is φ = 212531830.

The previous prime is 212531827. The next prime is 212531849. The reversal of 212531831 is 138135212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212531831 - 2² = 212531827 is a prime.

It is a super-2 number, since 2×212531831² = 90339558376425122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212531831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212531861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106265915 + 106265916.

It is an arithmetic number, because the mean of its divisors is an integer number (106265916).

Almost surely, 2^212531831 is an apocalyptic number.

212531831 is a deficient number, since it is larger than the sum of its proper divisors (1).

212531831 is an equidigital number, since it uses as much as digits as its factorization.

212531831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 212531831 is about 14578.4714905233. The cubic root of 212531831 is about 596.7713903690.

The spelling of 212531831 in words is "two hundred twelve million, five hundred thirty-one thousand, eight hundred thirty-one".