1161123505 has 8 divisors (see below), whose sum is σ = 1399953024. Its totient is φ = 924495600.

The previous prime is 1161123503. The next prime is 1161123517. The reversal of 1161123505 is 5053211611.

It is a happy number.

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

It is not a de Polignac number, because 1161123505 - 2¹ = 1161123503 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 1161123505.

It is not an unprimeable number, because it can be changed into a prime (1161123503) 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, 549241 + ... + 551350.

It is an arithmetic number, because the mean of its divisors is an integer number (174994128).

Almost surely, 2^1161123505 is an apocalyptic number.

It is an amenable number.

1161123505 is a deficient number, since it is larger than the sum of its proper divisors (238829519).

1161123505 is a wasteful number, since it uses less digits than its factorization.

1161123505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100807.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1161123505 is about 34075.2623614258. The cubic root of 1161123505 is about 1051.0566852853.

The spelling of 1161123505 in words is "one billion, one hundred sixty-one million, one hundred twenty-three thousand, five hundred five".