1191885005 has 4 divisors (see below), whose sum is σ = 1430262012. Its totient is φ = 953508000.

The previous prime is 1191884987. The next prime is 1191885017. The reversal of 1191885005 is 5005881911.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 603046249 + 588838756 = 24557^2 + 24266^2 .

It is not a de Polignac number, because 1191885005 - 2¹² = 1191880909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1191885005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119188496 + ... + 119188505.

It is an arithmetic number, because the mean of its divisors is an integer number (357565503).

Almost surely, 2^1191885005 is an apocalyptic number.

It is an amenable number.

1191885005 is a deficient number, since it is larger than the sum of its proper divisors (238377007).

1191885005 is an equidigital number, since it uses as much as digits as its factorization.

1191885005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238377006.

The product of its (nonzero) digits is 14400, while the sum is 38.

The square root of 1191885005 is about 34523.6875927239. The cubic root of 1191885005 is about 1060.2577411101.

The spelling of 1191885005 in words is "one billion, one hundred ninety-one million, eight hundred eighty-five thousand, five".