1311561156103 has 8 divisors (see below), whose sum is σ = 1431958196880. Its totient is φ = 1191358150080.

The previous prime is 1311561156079. The next prime is 1311561156133. The reversal of 1311561156103 is 3016511651131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311561156103 - 2⁹ = 1311561155591 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 (1311561156133) 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, 48494550 + ... + 48521587.

It is an arithmetic number, because the mean of its divisors is an integer number (178994774610).

Almost surely, 2^{1311561156103} is an apocalyptic number.

1311561156103 is a deficient number, since it is larger than the sum of its proper divisors (120397040777).

1311561156103 is a wasteful number, since it uses less digits than its factorization.

1311561156103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97017377.

The product of its (nonzero) digits is 8100, while the sum is 34.

The spelling of 1311561156103 in words is "one trillion, three hundred eleven billion, five hundred sixty-one million, one hundred fifty-six thousand, one hundred three".