212523553 has 6 divisors (see below), whose sum is σ = 233600402. Its totient is φ = 193203120.

The previous prime is 212523551. The next prime is 212523581. The reversal of 212523553 is 355325212.

It can be written as a sum of positive squares in only one way, i.e., 209873169 + 2650384 = 14487^2 + 1628^2 .

It is not a de Polignac number, because 212523553 - 2¹ = 212523551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212523551) 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 5 ways as a sum of consecutive naturals, for example, 878076 + ... + 878317.

Almost surely, 2^212523553 is an apocalyptic number.

It is an amenable number.

212523553 is a deficient number, since it is larger than the sum of its proper divisors (21076849).

212523553 is a wasteful number, since it uses less digits than its factorization.

212523553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756415 (or 1756404 counting only the distinct ones).

The product of its digits is 9000, while the sum is 28.

The square root of 212523553 is about 14578.1875759643. The cubic root of 212523553 is about 596.7636422940.

Adding to 212523553 its reverse (355325212), we get a palindrome (567848765).

The spelling of 212523553 in words is "two hundred twelve million, five hundred twenty-three thousand, five hundred fifty-three".