212783531 has 4 divisors (see below), whose sum is σ = 215347272. Its totient is φ = 210219792.

The previous prime is 212783503. The next prime is 212783533. The reversal of 212783531 is 135387212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212783531 - 2¹⁴ = 212767147 is a prime.

It is a super-2 number, since 2×212783531² = 90553662129655922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212783533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281746 + ... + 1281911.

It is an arithmetic number, because the mean of its divisors is an integer number (53836818).

Almost surely, 2^212783531 is an apocalyptic number.

212783531 is a deficient number, since it is larger than the sum of its proper divisors (2563741).

212783531 is an equidigital number, since it uses as much as digits as its factorization.

212783531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563740.

The product of its digits is 10080, while the sum is 32.

The square root of 212783531 is about 14587.1015284052. The cubic root of 212783531 is about 597.0068815277.

It can be divided in two parts, 2127 and 83531, that added together give a palindrome (85658).

The spelling of 212783531 in words is "two hundred twelve million, seven hundred eighty-three thousand, five hundred thirty-one".