240807311981 has 4 divisors (see below), whose sum is σ = 240815615964. Its totient is φ = 240799008000.

The previous prime is 240807311959. The next prime is 240807311989. The reversal of 240807311981 is 189113708042.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79881977956 + 160925334025 = 282634^2 + 401155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240807311981 is a prime.

It is a super-2 number, since 2×240807311981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240807311989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4108340 + ... + 4166541.

It is an arithmetic number, because the mean of its divisors is an integer number (60203903991).

Almost surely, 2^240807311981 is an apocalyptic number.

It is an amenable number.

240807311981 is a deficient number, since it is larger than the sum of its proper divisors (8303983).

240807311981 is an equidigital number, since it uses as much as digits as its factorization.

240807311981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8303982.

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 240807311981 in words is "two hundred forty billion, eight hundred seven million, three hundred eleven thousand, nine hundred eighty-one".