212522531 has 4 divisors (see below), whose sum is σ = 228870432. Its totient is φ = 196174632.

The previous prime is 212522509. The next prime is 212522567. The reversal of 212522531 is 135225212.

212522531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212522531 is a prime.

It is a super-2 number, since 2×212522531² = 90331652365291922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212522497 and 212522506.

It is not an unprimeable number, because it can be changed into a prime (212522501) 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, 8173931 + ... + 8173956.

It is an arithmetic number, because the mean of its divisors is an integer number (57217608).

Almost surely, 2^212522531 is an apocalyptic number.

212522531 is a deficient number, since it is larger than the sum of its proper divisors (16347901).

212522531 is a wasteful number, since it uses less digits than its factorization.

212522531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16347900.

The product of its digits is 1200, while the sum is 23.

The square root of 212522531 is about 14578.1525235539. The cubic root of 212522531 is about 596.7626857044.

Adding to 212522531 its reverse (135225212), we get a palindrome (347747743).

The spelling of 212522531 in words is "two hundred twelve million, five hundred twenty-two thousand, five hundred thirty-one".