305740681 has 2 divisors, whose sum is σ = 305740682. Its totient is φ = 305740680.

The previous prime is 305740667. The next prime is 305740703. The reversal of 305740681 is 186047503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187279225 + 118461456 = 13685^2 + 10884^2 .

It is a cyclic number.

It is not a de Polignac number, because 305740681 - 2¹³ = 305732489 is a prime.

It is a super-2 number, since 2×305740681² = 186954728036687522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (305740481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152870340 + 152870341.

It is an arithmetic number, because the mean of its divisors is an integer number (152870341).

Almost surely, 2^305740681 is an apocalyptic number.

It is an amenable number.

305740681 is a deficient number, since it is larger than the sum of its proper divisors (1).

305740681 is an equidigital number, since it uses as much as digits as its factorization.

305740681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 305740681 is about 17485.4419732531. The cubic root of 305740681 is about 673.6760007672.

The spelling of 305740681 in words is "three hundred five million, seven hundred forty thousand, six hundred eighty-one".