240353887081 has 27 divisors (see below), whose sum is σ = 307372077117. Its totient is φ = 187259327640.

The previous prime is 240353887057. The next prime is 240353887087. The reversal of 240353887081 is 180788353042.

The square root of 240353887081 is 490259.

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

It is not a de Polignac number, because 240353887081 - 2²⁷ = 240219669353 is a prime.

It is a super-2 number, since 2×240353887081² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (240353887087) 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, 37746760 + ... + 37753126.

Almost surely, 2^240353887081 is an apocalyptic number.

240353887081 is the 490259-th square number.

240353887081 is the 245130-th centered octagonal number.

It is an amenable number.

240353887081 is a deficient number, since it is larger than the sum of its proper divisors (67018190036).

240353887081 is an frugal number, since it uses more digits than its factorization.

240353887081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12770 (or 6385 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

Multiplying 240353887081 by its sum of digits (49), we get a square (11777340466969 = 3431813²).

240353887081 divided by its sum of digits (49) gives a square (4905181369 = 70037²).

The spelling of 240353887081 in words is "two hundred forty billion, three hundred fifty-three million, eight hundred eighty-seven thousand, eighty-one".