155087129 has 2 divisors, whose sum is σ = 155087130. Its totient is φ = 155087128.

The previous prime is 155087089. The next prime is 155087131. The reversal of 155087129 is 921780551.

155087129 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., 138603529 + 16483600 = 11773^2 + 4060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155087129 is a prime.

Together with 155087131, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 155087092 and 155087101.

It is not a weakly prime, because it can be changed into another prime (155087159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77543564 + 77543565.

It is an arithmetic number, because the mean of its divisors is an integer number (77543565).

Almost surely, 2^155087129 is an apocalyptic number.

It is an amenable number.

155087129 is a deficient number, since it is larger than the sum of its proper divisors (1).

155087129 is an equidigital number, since it uses as much as digits as its factorization.

155087129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 155087129 is about 12453.3982912296. The cubic root of 155087129 is about 537.2691681620.

The spelling of 155087129 in words is "one hundred fifty-five million, eighty-seven thousand, one hundred twenty-nine".