212531 has 6 divisors (see below), whose sum is σ = 233532. Its totient is φ = 191820.

The previous prime is 212507. The next prime is 212557. The reversal of 212531 is 135212.

It is a happy number.

212531 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 212531 - 2⁶ = 212467 is a prime.

It is a super-2 number, since 2×212531² = 90338851922, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (212501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1460 + ... + 1598.

It is an arithmetic number, because the mean of its divisors is an integer number (38922).

2²¹²⁵³¹ is an apocalyptic number.

212531 is a deficient number, since it is larger than the sum of its proper divisors (21001).

212531 is an equidigital number, since it uses as much as digits as its factorization.

212531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 150 counting only the distinct ones).

The product of its digits is 60, while the sum is 14.

The square root of 212531 is about 461.0108458594. The cubic root of 212531 is about 59.6770612575.

Adding to 212531 its reverse (135212), we get a palindrome (347743).

It can be divided in two parts, 21 and 2531, that added together give a palindrome (2552).

The spelling of 212531 in words is "two hundred twelve thousand, five hundred thirty-one".