1129878205 has 8 divisors (see below), whose sum is σ = 1388923704. Its totient is φ = 881856000.

The previous prime is 1129878179. The next prime is 1129878209. The reversal of 1129878205 is 5028789211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36517849 + 1093360356 = 6043^2 + 33066^2 .

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

It is not a de Polignac number, because 1129878205 - 2¹³ = 1129870013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129878209) 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, 2755596 + ... + 2756005.

It is an arithmetic number, because the mean of its divisors is an integer number (173615463).

Almost surely, 2^1129878205 is an apocalyptic number.

It is an amenable number.

1129878205 is a deficient number, since it is larger than the sum of its proper divisors (259045499).

1129878205 is an equidigital number, since it uses as much as digits as its factorization.

1129878205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5511647.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 1129878205 is about 33613.6609877591. The cubic root of 1129878205 is about 1041.5430143427.

The spelling of 1129878205 in words is "one billion, one hundred twenty-nine million, eight hundred seventy-eight thousand, two hundred five".