305235241981 has 2 divisors, whose sum is σ = 305235241982. Its totient is φ = 305235241980.

The previous prime is 305235241939. The next prime is 305235242033. The reversal of 305235241981 is 189142532503.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244505525625 + 60729716356 = 494475^2 + 246434^2 .

It is a cyclic number.

It is not a de Polignac number, because 305235241981 - 2⁷ = 305235241853 is a prime.

It is a super-2 number, since 2×305235241981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305235241781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152617620990 + 152617620991.

It is an arithmetic number, because the mean of its divisors is an integer number (152617620991).

Almost surely, 2^305235241981 is an apocalyptic number.

It is an amenable number.

305235241981 is a deficient number, since it is larger than the sum of its proper divisors (1).

305235241981 is an equidigital number, since it uses as much as digits as its factorization.

305235241981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 305235241981 in words is "three hundred five billion, two hundred thirty-five million, two hundred forty-one thousand, nine hundred eighty-one".