185390471213 has 2 divisors, whose sum is σ = 185390471214. Its totient is φ = 185390471212.

The previous prime is 185390471191. The next prime is 185390471269. The reversal of 185390471213 is 312174093581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174538457284 + 10852013929 = 417778^2 + 104173^2 .

It is a cyclic number.

It is not a de Polignac number, because 185390471213 - 2¹⁰ = 185390470189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185390471713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92695235606 + 92695235607.

It is an arithmetic number, because the mean of its divisors is an integer number (92695235607).

Almost surely, 2^185390471213 is an apocalyptic number.

It is an amenable number.

185390471213 is a deficient number, since it is larger than the sum of its proper divisors (1).

185390471213 is an equidigital number, since it uses as much as digits as its factorization.

185390471213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 185390471213 in words is "one hundred eighty-five billion, three hundred ninety million, four hundred seventy-one thousand, two hundred thirteen".