203212525681 has 27 divisors (see below), whose sum is σ = 226063113913. Its totient is φ = 182534291720.

The previous prime is 203212525567. The next prime is 203212525687. The reversal of 203212525681 is 186525212302.

The square root of 203212525681 is 450791.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 203212525681 - 2¹⁵ = 203212492913 is a prime.

It is a super-2 number, since 2×203212525681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203212525681.

It is not an unprimeable number, because it can be changed into a prime (203212525687) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 530580816 + ... + 530581198.

Almost surely, 2^203212525681 is an apocalyptic number.

203212525681 is the 450791-st square number.

203212525681 is the 225396-th centered octagonal number.

It is an amenable number.

203212525681 is a deficient number, since it is larger than the sum of its proper divisors (22850588232).

203212525681 is an frugal number, since it uses more digits than its factorization.

203212525681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 203212525681 its reverse (186525212302), we get a palindrome (389737737983).

The spelling of 203212525681 in words is "two hundred three billion, two hundred twelve million, five hundred twenty-five thousand, six hundred eighty-one".