1271816791937 has 4 divisors (see below), whose sum is σ = 1312843140096. Its totient is φ = 1230790443780.

The previous prime is 1271816791919. The next prime is 1271816791951. The reversal of 1271816791937 is 7391976181721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1271816791937 - 2¹⁴ = 1271816775553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1271816791937.

It is not an unprimeable number, because it can be changed into a prime (1271846791937) 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, 20513174033 + ... + 20513174094.

It is an arithmetic number, because the mean of its divisors is an integer number (328210785024).

Almost surely, 2^{1271816791937} is an apocalyptic number.

It is an amenable number.

1271816791937 is a deficient number, since it is larger than the sum of its proper divisors (41026348159).

1271816791937 is an equidigital number, since it uses as much as digits as its factorization.

1271816791937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41026348158.

The product of its digits is 8001504, while the sum is 62.

The spelling of 1271816791937 in words is "one trillion, two hundred seventy-one billion, eight hundred sixteen million, seven hundred ninety-one thousand, nine hundred thirty-seven".