1271742349 has 4 divisors (see below), whose sum is σ = 1283409820. Its totient is φ = 1260074880.

The previous prime is 1271742347. The next prime is 1271742359. The reversal of 1271742349 is 9432471721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9432471721 = 3359 ⋅2808119.

It can be written as a sum of positive squares in 2 ways, for example, as 470456100 + 801286249 = 21690^2 + 28307^2 .

It is not a de Polignac number, because 1271742349 - 2¹ = 1271742347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271742347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5833572 + ... + 5833789.

It is an arithmetic number, because the mean of its divisors is an integer number (320852455).

Almost surely, 2^1271742349 is an apocalyptic number.

It is an amenable number.

1271742349 is a deficient number, since it is larger than the sum of its proper divisors (11667471).

1271742349 is a wasteful number, since it uses less digits than its factorization.

1271742349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11667470.

The product of its digits is 84672, while the sum is 40.

The square root of 1271742349 is about 35661.4967296663. The cubic root of 1271742349 is about 1083.4271416255.

The spelling of 1271742349 in words is "one billion, two hundred seventy-one million, seven hundred forty-two thousand, three hundred forty-nine".