1271791441 has 2 divisors, whose sum is σ = 1271791442. Its totient is φ = 1271791440.

The previous prime is 1271791421. The next prime is 1271791453. The reversal of 1271791441 is 1441971721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989417025 + 282374416 = 31455^2 + 16804^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271791441 - 2⁹ = 1271790929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1271791441.

It is not a weakly prime, because it can be changed into another prime (1271791421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635895720 + 635895721.

It is an arithmetic number, because the mean of its divisors is an integer number (635895721).

Almost surely, 2^1271791441 is an apocalyptic number.

It is an amenable number.

1271791441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271791441 is an equidigital number, since it uses as much as digits as its factorization.

1271791441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 37.

The square root of 1271791441 is about 35662.1850284023. The cubic root of 1271791441 is about 1083.4410823217.

The spelling of 1271791441 in words is "one billion, two hundred seventy-one million, seven hundred ninety-one thousand, four hundred forty-one".