155171143121 has 4 divisors (see below), whose sum is σ = 156594731700. Its totient is φ = 153747554544.

The previous prime is 155171143109. The next prime is 155171143147. The reversal of 155171143121 is 121341171551.

155171143121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113189182096 + 41981961025 = 336436^2 + 204895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155171143121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155171140121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711794126 + ... + 711794343.

It is an arithmetic number, because the mean of its divisors is an integer number (39148682925).

Almost surely, 2^155171143121 is an apocalyptic number.

It is an amenable number.

155171143121 is a deficient number, since it is larger than the sum of its proper divisors (1423588579).

155171143121 is a wasteful number, since it uses less digits than its factorization.

155171143121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423588578.

The product of its digits is 4200, while the sum is 32.

The spelling of 155171143121 in words is "one hundred fifty-five billion, one hundred seventy-one million, one hundred forty-three thousand, one hundred twenty-one".