1129255843 has 4 divisors (see below), whose sum is σ = 1130333400. Its totient is φ = 1128178288.

The previous prime is 1129255807. The next prime is 1129255859. The reversal of 1129255843 is 3485529211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3485529211 = 157 ⋅22200823.

It is a cyclic number.

It is not a de Polignac number, because 1129255843 - 2²¹ = 1127158691 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1129255796 and 1129255805.

It is not an unprimeable number, because it can be changed into a prime (1129255343) 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, 537205 + ... + 539302.

It is an arithmetic number, because the mean of its divisors is an integer number (282583350).

Almost surely, 2^1129255843 is an apocalyptic number.

1129255843 is a deficient number, since it is larger than the sum of its proper divisors (1077557).

1129255843 is a wasteful number, since it uses less digits than its factorization.

1129255843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077556.

The product of its digits is 86400, while the sum is 40.

The square root of 1129255843 is about 33604.4021372201. The cubic root of 1129255843 is about 1041.3517442145.

The spelling of 1129255843 in words is "one billion, one hundred twenty-nine million, two hundred fifty-five thousand, eight hundred forty-three".