1155538129 has 2 divisors, whose sum is σ = 1155538130. Its totient is φ = 1155538128.

The previous prime is 1155538081. The next prime is 1155538177. The reversal of 1155538129 is 9218355511.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1155538081) and next prime (1155538177).

It can be written as a sum of positive squares in only one way, i.e., 658025104 + 497513025 = 25652^2 + 22305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155538129 - 2²⁷ = 1021320401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1155538091 and 1155538100.

It is not a weakly prime, because it can be changed into another prime (1155538199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577769064 + 577769065.

It is an arithmetic number, because the mean of its divisors is an integer number (577769065).

Almost surely, 2^1155538129 is an apocalyptic number.

It is an amenable number.

1155538129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155538129 is an equidigital number, since it uses as much as digits as its factorization.

1155538129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 40.

The square root of 1155538129 is about 33993.2071008312. The cubic root of 1155538129 is about 1049.3686693060.

The spelling of 1155538129 in words is "one billion, one hundred fifty-five million, five hundred thirty-eight thousand, one hundred twenty-nine".