155121055105349 has 2 divisors, whose sum is σ = 155121055105350. Its totient is φ = 155121055105348.

The previous prime is 155121055105333. The next prime is 155121055105381. The reversal of 155121055105349 is 943501550121551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104580586396225 + 50540468709124 = 10226465^2 + 7109182^2 .

It is an emirp because it is prime and its reverse (943501550121551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155121055105349 - 2⁴ = 155121055105333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155121055107349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77560527552674 + 77560527552675.

It is an arithmetic number, because the mean of its divisors is an integer number (77560527552675).

Almost surely, 2^{155121055105349} is an apocalyptic number.

It is an amenable number.

155121055105349 is a deficient number, since it is larger than the sum of its proper divisors (1).

155121055105349 is an equidigital number, since it uses as much as digits as its factorization.

155121055105349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 675000, while the sum is 47.

The spelling of 155121055105349 in words is "one hundred fifty-five trillion, one hundred twenty-one billion, fifty-five million, one hundred five thousand, three hundred forty-nine".