1261319847013 has 4 divisors (see below), whose sum is σ = 1261713643488. Its totient is φ = 1260926050540.

The previous prime is 1261319846977. The next prime is 1261319847059. The reversal of 1261319847013 is 3107489131621.

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 a de Polignac number, because none of the positive numbers 2^k-1261319847013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261319847113) 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, 196893433 + ... + 196899838.

It is an arithmetic number, because the mean of its divisors is an integer number (315428410872).

Almost surely, 2^{1261319847013} is an apocalyptic number.

It is an amenable number.

1261319847013 is a deficient number, since it is larger than the sum of its proper divisors (393796475).

1261319847013 is an equidigital number, since it uses as much as digits as its factorization.

1261319847013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393796474.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 1261319847013 in words is "one trillion, two hundred sixty-one billion, three hundred nineteen million, eight hundred forty-seven thousand, thirteen".