1271145549 has 4 divisors (see below), whose sum is σ = 1694860736. Its totient is φ = 847430364.

The previous prime is 1271145479. The next prime is 1271145571. The reversal of 1271145549 is 9455411721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1271145549 - 2²¹ = 1269048397 is a prime.

It is a super-2 number, since 2×1271145549² = 3231622013485022802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271145349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211857589 + ... + 211857594.

It is an arithmetic number, because the mean of its divisors is an integer number (423715184).

Almost surely, 2^1271145549 is an apocalyptic number.

It is an amenable number.

1271145549 is a deficient number, since it is larger than the sum of its proper divisors (423715187).

1271145549 is an equidigital number, since it uses as much as digits as its factorization.

1271145549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423715186.

The product of its digits is 50400, while the sum is 39.

The square root of 1271145549 is about 35653.1281797264. The cubic root of 1271145549 is about 1083.2576391347.

The spelling of 1271145549 in words is "one billion, two hundred seventy-one million, one hundred forty-five thousand, five hundred forty-nine".