523942897921 has 3 divisors (see below), whose sum is σ = 523943621761. Its totient is φ = 523942174082.

The previous prime is 523942897909. The next prime is 523942897957. The reversal of 523942897921 is 129798249325.

The square root of 523942897921 is 723839.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 523942897921 - 2⁵ = 523942897889 is a prime.

It is a super-2 number, since 2×523942897921² (a number of 24 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 523942897921.

It is not an unprimeable number, because it can be changed into a prime (523942897991) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 361920 + ... + 1085758.

Almost surely, 2^523942897921 is an apocalyptic number.

523942897921 is the 723839-th square number.

523942897921 is the 361920-th centered octagonal number.

It is an amenable number.

523942897921 is a deficient number, since it is larger than the sum of its proper divisors (723840).

523942897921 is an frugal number, since it uses more digits than its factorization.

523942897921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447678 (or 723839 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 61.

The spelling of 523942897921 in words is "five hundred twenty-three billion, nine hundred forty-two million, eight hundred ninety-seven thousand, nine hundred twenty-one".