1129956505 has 16 divisors (see below), whose sum is σ = 1465894080. Its totient is φ = 833239872.

The previous prime is 1129956491. The next prime is 1129956511. The reversal of 1129956505 is 5056599211.

It is a cyclic number.

It is not a de Polignac number, because 1129956505 - 2¹¹ = 1129954457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157219 + ... + 164248.

It is an arithmetic number, because the mean of its divisors is an integer number (91618380).

Almost surely, 2^1129956505 is an apocalyptic number.

It is an amenable number.

1129956505 is a deficient number, since it is larger than the sum of its proper divisors (335937575).

1129956505 is a wasteful number, since it uses less digits than its factorization.

1129956505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321528.

The product of its (nonzero) digits is 121500, while the sum is 43.

The square root of 1129956505 is about 33614.8256726106. The cubic root of 1129956505 is about 1041.5670732587.

The spelling of 1129956505 in words is "one billion, one hundred twenty-nine million, nine hundred fifty-six thousand, five hundred five".