1271817247091 has 4 divisors (see below), whose sum is σ = 1274472398400. Its totient is φ = 1269162095784.

The previous prime is 1271817247073. The next prime is 1271817247109. The reversal of 1271817247091 is 1907427181721.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1271817247073) and next prime (1271817247109).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271817247091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271817247021) 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, 1327574936 + ... + 1327575893.

It is an arithmetic number, because the mean of its divisors is an integer number (318618099600).

Almost surely, 2^{1271817247091} is an apocalyptic number.

1271817247091 is a deficient number, since it is larger than the sum of its proper divisors (2655151309).

1271817247091 is an equidigital number, since it uses as much as digits as its factorization.

1271817247091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655151308.

The product of its (nonzero) digits is 395136, while the sum is 50.

The spelling of 1271817247091 in words is "one trillion, two hundred seventy-one billion, eight hundred seventeen million, two hundred forty-seven thousand, ninety-one".