231242240081 has 2 divisors, whose sum is σ = 231242240082. Its totient is φ = 231242240080.

The previous prime is 231242240071. The next prime is 231242240137. The reversal of 231242240081 is 180042242132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222571650625 + 8670589456 = 471775^2 + 93116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231242240081 is a prime.

It is a super-2 number, since 2×231242240081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231242240041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115621120040 + 115621120041.

It is an arithmetic number, because the mean of its divisors is an integer number (115621120041).

Almost surely, 2^231242240081 is an apocalyptic number.

It is an amenable number.

231242240081 is a deficient number, since it is larger than the sum of its proper divisors (1).

231242240081 is an equidigital number, since it uses as much as digits as its factorization.

231242240081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 29.

The spelling of 231242240081 in words is "two hundred thirty-one billion, two hundred forty-two million, two hundred forty thousand, eighty-one".