1271956545 has 12 divisors (see below), whose sum is σ = 2204724756. Its totient is φ = 678376800.

The previous prime is 1271956537. The next prime is 1271956561. The reversal of 1271956545 is 5456591721.

It is a happy number.

1271956545 is a `hidden beast` number, since 12 + 7 + 1 + 95 + 6 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 163865601 + 1108090944 = 12801^2 + 33288^2 .

It is not a de Polignac number, because 1271956545 - 2³ = 1271956537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 28265701 = 1271956545 / (1 + 2 + 7 + 1 + 9 + 5 + 6 + 5 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1271956545.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14132806 + ... + 14132895.

It is an arithmetic number, because the mean of its divisors is an integer number (183727063).

Almost surely, 2^1271956545 is an apocalyptic number.

1271956545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1271956545 is a deficient number, since it is larger than the sum of its proper divisors (932768211).

1271956545 is a wasteful number, since it uses less digits than its factorization.

1271956545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28265712 (or 28265709 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The square root of 1271956545 is about 35664.4997862020. The cubic root of 1271956545 is about 1083.4879644100.

The spelling of 1271956545 in words is "one billion, two hundred seventy-one million, nine hundred fifty-six thousand, five hundred forty-five".