305855213 has 2 divisors, whose sum is σ = 305855214. Its totient is φ = 305855212.

The previous prime is 305855189. The next prime is 305855287. The reversal of 305855213 is 312558503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276457129 + 29398084 = 16627^2 + 5422^2 .

It is a cyclic number.

It is not a de Polignac number, because 305855213 - 2¹⁰ = 305854189 is a prime.

It is a super-2 number, since 2×305855213² = 187094822638550738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 305855213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305855713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152927606 + 152927607.

It is an arithmetic number, because the mean of its divisors is an integer number (152927607).

Almost surely, 2^305855213 is an apocalyptic number.

It is an amenable number.

305855213 is a deficient number, since it is larger than the sum of its proper divisors (1).

305855213 is an equidigital number, since it uses as much as digits as its factorization.

305855213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 305855213 is about 17488.7167339402. The cubic root of 305855213 is about 673.7601110737.

The spelling of 305855213 in words is "three hundred five million, eight hundred fifty-five thousand, two hundred thirteen".