1291345867876 has 9 divisors (see below), whose sum is σ = 2259859246099. Its totient is φ = 645671797564.

The previous prime is 1291345867849. The next prime is 1291345867883. The reversal of 1291345867876 is 6787685431921.

The square root of 1291345867876 is 1136374.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1988655 + ... + 2556841.

Almost surely, 2^{1291345867876} is an apocalyptic number.

1291345867876 is the 1136374-th square number.

It is an amenable number.

1291345867876 is a deficient number, since it is larger than the sum of its proper divisors (968513378223).

1291345867876 is an frugal number, since it uses more digits than its factorization.

1291345867876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136378 (or 568189 counting only the distinct ones).

The product of its digits is 121927680, while the sum is 67.

The spelling of 1291345867876 in words is "one trillion, two hundred ninety-one billion, three hundred forty-five million, eight hundred sixty-seven thousand, eight hundred seventy-six".