1271265536 has 36 divisors (see below), whose sum is σ = 2606167452. Its totient is φ = 618448896.

The previous prime is 1271265533. The next prime is 1271265641. The reversal of 1271265536 is 6355621721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1044582400 + 226683136 = 32320^2 + 15056^2 .

It is a super-2 number, since 2×1271265536² = 3232232126042734592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1271265536.

It is not an unprimeable number, because it can be changed into a prime (1271265533) 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, 57635 + ... + 76578.

Almost surely, 2^1271265536 is an apocalyptic number.

1271265536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1271265536 is an abundant number, since it is smaller than the sum of its proper divisors (1334901916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271265536 is an equidigital number, since it uses as much as digits as its factorization.

1271265536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134266 (or 134252 counting only the distinct ones).

The product of its digits is 75600, while the sum is 38.

The square root of 1271265536 is about 35654.8108394926. The cubic root of 1271265536 is about 1083.2917219730.

The spelling of 1271265536 in words is "one billion, two hundred seventy-one million, two hundred sixty-five thousand, five hundred thirty-six".