2155129 has 2 divisors, whose sum is σ = 2155130. Its totient is φ = 2155128.

The previous prime is 2155121. The next prime is 2155133. The reversal of 2155129 is 9215512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1317904 + 837225 = 1148^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155129 - 2³ = 2155121 is a prime.

2155129 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077564 + 1077565.

It is an arithmetic number, because the mean of its divisors is an integer number (1077565).

2^2155129 is an apocalyptic number.

It is an amenable number.

2155129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155129 is an equidigital number, since it uses as much as digits as its factorization.

2155129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 25.

The square root of 2155129 is about 1468.0357625072. The cubic root of 2155129 is about 129.1688392744.

The spelling of 2155129 in words is "two million, one hundred fifty-five thousand, one hundred twenty-nine".