1129139785 has 8 divisors (see below), whose sum is σ = 1356070536. Its totient is φ = 902576640.

The previous prime is 1129139783. The next prime is 1129139801. The reversal of 1129139785 is 5879319211.

It can be written as a sum of positive squares in 4 ways, for example, as 519247369 + 609892416 = 22787^2 + 24696^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1129139785 - 2¹ = 1129139783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1129139783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85096 + ... + 97465.

It is an arithmetic number, because the mean of its divisors is an integer number (169508817).

Almost surely, 2^1129139785 is an apocalyptic number.

It is an amenable number.

1129139785 is a deficient number, since it is larger than the sum of its proper divisors (226930751).

1129139785 is a wasteful number, since it uses less digits than its factorization.

1129139785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183803.

The product of its digits is 136080, while the sum is 46.

The square root of 1129139785 is about 33602.6752655202. The cubic root of 1129139785 is about 1041.3160684073.

It can be divided in two parts, 11291 and 39785, that added together give a square (51076 = 226²).

The spelling of 1129139785 in words is "one billion, one hundred twenty-nine million, one hundred thirty-nine thousand, seven hundred eighty-five".