1271781793631 has 8 divisors (see below), whose sum is σ = 1349177127264. Its totient is φ = 1194673642240.

The previous prime is 1271781793613. The next prime is 1271781793651. The reversal of 1271781793631 is 1363971871721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271781793631 is a prime.

It is a super-2 number, since 2×1271781793631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271781793651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71786435 + ... + 71804148.

It is an arithmetic number, because the mean of its divisors is an integer number (168647140908).

Almost surely, 2^{1271781793631} is an apocalyptic number.

1271781793631 is a deficient number, since it is larger than the sum of its proper divisors (77395333633).

1271781793631 is a wasteful number, since it uses less digits than its factorization.

1271781793631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143591121.

The product of its digits is 2667168, while the sum is 56.

The spelling of 1271781793631 in words is "one trillion, two hundred seventy-one billion, seven hundred eighty-one million, seven hundred ninety-three thousand, six hundred thirty-one".