1273271749 has 4 divisors (see below), whose sum is σ = 1273345164. Its totient is φ = 1273198336.

The previous prime is 1273271723. The next prime is 1273271777. The reversal of 1273271749 is 9471723721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9471723721 = 37 ⋅255992533.

It can be written as a sum of positive squares in 2 ways, for example, as 149010849 + 1124260900 = 12207^2 + 33530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1273271749 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 (1273271449) 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, 5439 + ... + 50755.

It is an arithmetic number, because the mean of its divisors is an integer number (318336291).

Almost surely, 2^1273271749 is an apocalyptic number.

It is an amenable number.

1273271749 is a deficient number, since it is larger than the sum of its proper divisors (73415).

1273271749 is an equidigital number, since it uses as much as digits as its factorization.

1273271749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73414.

The product of its digits is 148176, while the sum is 43.

The square root of 1273271749 is about 35682.9335817559. The cubic root of 1273271749 is about 1083.8612782205.

The spelling of 1273271749 in words is "one billion, two hundred seventy-three million, two hundred seventy-one thousand, seven hundred forty-nine".