1205051171 has 4 divisors (see below), whose sum is σ = 1275936552. Its totient is φ = 1134165792.

The previous prime is 1205051161. The next prime is 1205051201. The reversal of 1205051171 is 1711505021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1711505021 = 13901 ⋅123121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205051171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205051161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35442665 + ... + 35442698.

It is an arithmetic number, because the mean of its divisors is an integer number (318984138).

Almost surely, 2^1205051171 is an apocalyptic number.

1205051171 is a deficient number, since it is larger than the sum of its proper divisors (70885381).

1205051171 is an equidigital number, since it uses as much as digits as its factorization.

1205051171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70885380.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 1205051171 is about 34713.8469634237. The cubic root of 1205051171 is about 1064.1475014926.

Adding to 1205051171 its reverse (1711505021), we get a palindrome (2916556192).

The spelling of 1205051171 in words is "one billion, two hundred five million, fifty-one thousand, one hundred seventy-one".