155138129 has 2 divisors, whose sum is σ = 155138130. Its totient is φ = 155138128.

The previous prime is 155138119. The next prime is 155138131. The reversal of 155138129 is 921831551.

155138129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116100625 + 39037504 = 10775^2 + 6248^2 .

It is an emirp because it is prime and its reverse (921831551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155138129 - 2¹² = 155134033 is a prime.

Together with 155138131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155138119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77569064 + 77569065.

It is an arithmetic number, because the mean of its divisors is an integer number (77569065).

Almost surely, 2^155138129 is an apocalyptic number.

It is an amenable number.

155138129 is a deficient number, since it is larger than the sum of its proper divisors (1).

155138129 is an equidigital number, since it uses as much as digits as its factorization.

155138129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 35.

The square root of 155138129 is about 12455.4457567764. The cubic root of 155138129 is about 537.3280548982.

The spelling of 155138129 in words is "one hundred fifty-five million, one hundred thirty-eight thousand, one hundred twenty-nine".