155212129 has 2 divisors, whose sum is σ = 155212130. Its totient is φ = 155212128.

The previous prime is 155212117. The next prime is 155212171. The reversal of 155212129 is 921212551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152473104 + 2739025 = 12348^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 155212129 - 2¹⁵ = 155179361 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 155212097 and 155212106.

It is not a weakly prime, because it can be changed into another prime (155212229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77606064 + 77606065.

It is an arithmetic number, because the mean of its divisors is an integer number (77606065).

Almost surely, 2^155212129 is an apocalyptic number.

It is an amenable number.

155212129 is a deficient number, since it is larger than the sum of its proper divisors (1).

155212129 is an equidigital number, since it uses as much as digits as its factorization.

155212129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 155212129 is about 12458.4159908072. The cubic root of 155212129 is about 537.4134754540.

The spelling of 155212129 in words is "one hundred fifty-five million, two hundred twelve thousand, one hundred twenty-nine".