240059821681 has 3 divisors (see below), whose sum is σ = 240060311641. Its totient is φ = 240059331722.

The previous prime is 240059821667. The next prime is 240059821717. The reversal of 240059821681 is 186128950042.

The square root of 240059821681 is 489959.

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 240059821681 - 2²³ = 240051433073 is a prime.

It is a super-2 number, since 2×240059821681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240059821621) 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, 244980 + ... + 734938.

Almost surely, 2^240059821681 is an apocalyptic number.

240059821681 is the 489959-th square number.

240059821681 is the 244980-th centered octagonal number.

It is an amenable number.

240059821681 is a deficient number, since it is larger than the sum of its proper divisors (489960).

240059821681 is an frugal number, since it uses more digits than its factorization.

240059821681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979918 (or 489959 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 240059821681 in words is "two hundred forty billion, fifty-nine million, eight hundred twenty-one thousand, six hundred eighty-one".