1271791442 has 4 divisors (see below), whose sum is σ = 1907687166. Its totient is φ = 635895720.

The previous prime is 1271791441. The next prime is 1271791453. The reversal of 1271791442 is 2441971721.

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

It can be written as a sum of positive squares in only one way, i.e., 1212362761 + 59428681 = 34819^2 + 7709^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1271791396 and 1271791405.

It is not an unprimeable number, because it can be changed into a prime (1271791441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317947859 + ... + 317947862.

Almost surely, 2^1271791442 is an apocalyptic number.

1271791442 is a deficient number, since it is larger than the sum of its proper divisors (635895724).

1271791442 is an equidigital number, since it uses as much as digits as its factorization.

1271791442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635895723.

The product of its digits is 28224, while the sum is 38.

The square root of 1271791442 is about 35662.1850424227. The cubic root of 1271791442 is about 1083.4410826056.

The spelling of 1271791442 in words is "one billion, two hundred seventy-one million, seven hundred ninety-one thousand, four hundred forty-two".