240991646281 has 27 divisors (see below), whose sum is σ = 260483820807. Its totient is φ = 222911958720.

The previous prime is 240991646279. The next prime is 240991646297. The reversal of 240991646281 is 182646199042.

The square root of 240991646281 is 490909.

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

It can be written as a sum of positive squares in only one way, i.e., 187623254025 + 53368392256 = 433155^2 + 231016^2 .

It is not a de Polignac number, because 240991646281 - 2¹ = 240991646279 is a prime.

It is a super-2 number, since 2×240991646281² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (240991649281) 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, 559145136 + ... + 559145566.

Almost surely, 2^240991646281 is an apocalyptic number.

240991646281 is the 490909-th square number.

240991646281 is the 245455-th centered octagonal number.

It is an amenable number.

240991646281 is a deficient number, since it is larger than the sum of its proper divisors (19492174526).

240991646281 is an frugal number, since it uses more digits than its factorization.

240991646281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 240991646281 in words is "two hundred forty billion, nine hundred ninety-one million, six hundred forty-six thousand, two hundred eighty-one".