306212138173 has 2 divisors, whose sum is σ = 306212138174. Its totient is φ = 306212138172.

The previous prime is 306212138041. The next prime is 306212138201. The reversal of 306212138173 is 371831212603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224848569124 + 81363569049 = 474182^2 + 285243^2 .

It is a cyclic number.

It is not a de Polignac number, because 306212138173 - 2²¹ = 306210041021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306212138473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153106069086 + 153106069087.

It is an arithmetic number, because the mean of its divisors is an integer number (153106069087).

Almost surely, 2^306212138173 is an apocalyptic number.

It is an amenable number.

306212138173 is a deficient number, since it is larger than the sum of its proper divisors (1).

306212138173 is an equidigital number, since it uses as much as digits as its factorization.

306212138173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 306212138173 in words is "three hundred six billion, two hundred twelve million, one hundred thirty-eight thousand, one hundred seventy-three".