1161305205 has 8 divisors (see below), whose sum is σ = 1858088352. Its totient is φ = 619362768.

The previous prime is 1161305191. The next prime is 1161305219. The reversal of 1161305205 is 5025031611.

It is an interprime number because it is at equal distance from previous prime (1161305191) and next prime (1161305219).

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

It is not a de Polignac number, because 1161305205 - 2¹⁸ = 1161043061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38710159 + ... + 38710188.

It is an arithmetic number, because the mean of its divisors is an integer number (232261044).

Almost surely, 2^1161305205 is an apocalyptic number.

1161305205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161305205 is a deficient number, since it is larger than the sum of its proper divisors (696783147).

1161305205 is an equidigital number, since it uses as much as digits as its factorization.

1161305205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77420355.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1161305205 is about 34077.9284141510. The cubic root of 1161305205 is about 1051.1115077735. Note that the first 3 decimals are identical.

Adding to 1161305205 its reverse (5025031611), we get a palindrome (6186336816).

The spelling of 1161305205 in words is "one billion, one hundred sixty-one million, three hundred five thousand, two hundred five".