155420129 has 2 divisors, whose sum is σ = 155420130. Its totient is φ = 155420128.

The previous prime is 155420107. The next prime is 155420141. The reversal of 155420129 is 921024551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143448529 + 11971600 = 11977^2 + 3460^2 .

It is an emirp because it is prime and its reverse (921024551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155420129 - 2¹⁶ = 155354593 is a prime.

It is not a weakly prime, because it can be changed into another prime (155420159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77710064 + 77710065.

It is an arithmetic number, because the mean of its divisors is an integer number (77710065).

Almost surely, 2^155420129 is an apocalyptic number.

It is an amenable number.

155420129 is a deficient number, since it is larger than the sum of its proper divisors (1).

155420129 is an equidigital number, since it uses as much as digits as its factorization.

155420129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 155420129 is about 12466.7609666665. The cubic root of 155420129 is about 537.6534311578.

The spelling of 155420129 in words is "one hundred fifty-five million, four hundred twenty thousand, one hundred twenty-nine".