305128853 has 2 divisors, whose sum is σ = 305128854. Its totient is φ = 305128852.

The previous prime is 305128849. The next prime is 305128867. The reversal of 305128853 is 358821503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207158449 + 97970404 = 14393^2 + 9898^2 .

It is an emirp because it is prime and its reverse (358821503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 305128853 - 2² = 305128849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305128883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152564426 + 152564427.

It is an arithmetic number, because the mean of its divisors is an integer number (152564427).

Almost surely, 2^305128853 is an apocalyptic number.

It is an amenable number.

305128853 is a deficient number, since it is larger than the sum of its proper divisors (1).

305128853 is an equidigital number, since it uses as much as digits as its factorization.

305128853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 305128853 is about 17467.9378576866. The cubic root of 305128853 is about 673.2263287518.

The spelling of 305128853 in words is "three hundred five million, one hundred twenty-eight thousand, eight hundred fifty-three".