1271147205 has 32 divisors (see below), whose sum is σ = 2174425344. Its totient is φ = 631858176.

The previous prime is 1271147201. The next prime is 1271147221. The reversal of 1271147205 is 5027411721.

It is not a de Polignac number, because 1271147205 - 2² = 1271147201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271147201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2067 + ... + 50463.

It is an arithmetic number, because the mean of its divisors is an integer number (67950792).

Almost surely, 2^1271147205 is an apocalyptic number.

1271147205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1271147205 is a deficient number, since it is larger than the sum of its proper divisors (903278139).

1271147205 is a wasteful number, since it uses less digits than its factorization.

1271147205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48525.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 1271147205 is about 35653.1514034875. The cubic root of 1271147205 is about 1083.2581095434.

Adding to 1271147205 its reverse (5027411721), we get a palindrome (6298558926).

The spelling of 1271147205 in words is "one billion, two hundred seventy-one million, one hundred forty-seven thousand, two hundred five".