1271385963 has 12 divisors (see below), whose sum is σ = 1904463288. Its totient is φ = 847590480.

The previous prime is 1271385943. The next prime is 1271385967. The reversal of 1271385963 is 3695831721.

1271385963 is a `hidden beast` number, since 1 + 27 + 1 + 38 + 596 + 3 = 666.

It is not a de Polignac number, because 1271385963 - 2¹³ = 1271377771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1271385967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2615778 + ... + 2616263.

It is an arithmetic number, because the mean of its divisors is an integer number (158705274).

Almost surely, 2^1271385963 is an apocalyptic number.

1271385963 is a deficient number, since it is larger than the sum of its proper divisors (633077325).

1271385963 is an frugal number, since it uses more digits than its factorization.

1271385963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5232056 (or 5232044 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1271385963 is about 35656.4995898364. The cubic root of 1271385963 is about 1083.3259276391.

The spelling of 1271385963 in words is "one billion, two hundred seventy-one million, three hundred eighty-five thousand, nine hundred sixty-three".