155271121 has 2 divisors, whose sum is σ = 155271122. Its totient is φ = 155271120.

The previous prime is 155271119. The next prime is 155271167. The reversal of 155271121 is 121172551.

155271121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124634896 + 30636225 = 11164^2 + 5535^2 .

It is an emirp because it is prime and its reverse (121172551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155271121 - 2¹ = 155271119 is a prime.

Together with 155271119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155272121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77635560 + 77635561.

It is an arithmetic number, because the mean of its divisors is an integer number (77635561).

Almost surely, 2^155271121 is an apocalyptic number.

It is an amenable number.

155271121 is a deficient number, since it is larger than the sum of its proper divisors (1).

155271121 is an equidigital number, since it uses as much as digits as its factorization.

155271121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 700, while the sum is 25.

The square root of 155271121 is about 12460.7833220869. The cubic root of 155271121 is about 537.4815523505.

The spelling of 155271121 in words is "one hundred fifty-five million, two hundred seventy-one thousand, one hundred twenty-one".