1135556129 has 4 divisors (see below), whose sum is σ = 1135632576. Its totient is φ = 1135479684.

The previous prime is 1135556101. The next prime is 1135556221. The reversal of 1135556129 is 9216555311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1135556129 - 2¹⁶ = 1135490593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1135556092 and 1135556101.

It is not an unprimeable number, because it can be changed into a prime (1135556729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7949 + ... + 48314.

It is an arithmetic number, because the mean of its divisors is an integer number (283908144).

Almost surely, 2^1135556129 is an apocalyptic number.

It is an amenable number.

1135556129 is a deficient number, since it is larger than the sum of its proper divisors (76447).

1135556129 is an equidigital number, since it uses as much as digits as its factorization.

1135556129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76446.

The product of its digits is 40500, while the sum is 38.

The square root of 1135556129 is about 33698.0137248473. The cubic root of 1135556129 is about 1043.2847724361.

The spelling of 1135556129 in words is "one billion, one hundred thirty-five million, five hundred fifty-six thousand, one hundred twenty-nine".