1271260649 has 4 divisors (see below), whose sum is σ = 1272424836. Its totient is φ = 1270096464.

The previous prime is 1271260567. The next prime is 1271260651. The reversal of 1271260649 is 9460621721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1205131225 + 66129424 = 34715^2 + 8132^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271260649 - 2²⁸ = 1002825193 is a prime.

It is a super-2 number, since 2×1271260649² = 3232207275391802402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271260049) 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, 580454 + ... + 582639.

It is an arithmetic number, because the mean of its divisors is an integer number (318106209).

Almost surely, 2^1271260649 is an apocalyptic number.

It is an amenable number.

1271260649 is a deficient number, since it is larger than the sum of its proper divisors (1164187).

1271260649 is a wasteful number, since it uses less digits than its factorization.

1271260649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164186.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1271260649 is about 35654.7423073004. The cubic root of 1271260649 is about 1083.2903338410.

The spelling of 1271260649 in words is "one billion, two hundred seventy-one million, two hundred sixty thousand, six hundred forty-nine".