1311563040261 has 8 divisors (see below), whose sum is σ = 1752527721600. Its totient is φ = 872486859552.

The previous prime is 1311563040233. The next prime is 1311563040371. The reversal of 1311563040261 is 1620403651131.

It is a happy number.

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

It is not a de Polignac number, because 1311563040261 - 2¹¹ = 1311563038213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311563040211) 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, 472123536 + ... + 472126313.

It is an arithmetic number, because the mean of its divisors is an integer number (219065965200).

Almost surely, 2^{1311563040261} is an apocalyptic number.

It is an amenable number.

1311563040261 is a deficient number, since it is larger than the sum of its proper divisors (440964681339).

1311563040261 is an equidigital number, since it uses as much as digits as its factorization.

1311563040261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944250315.

The product of its (nonzero) digits is 12960, while the sum is 33.

Adding to 1311563040261 its reverse (1620403651131), we get a palindrome (2931966691392).

The spelling of 1311563040261 in words is "one trillion, three hundred eleven billion, five hundred sixty-three million, forty thousand, two hundred sixty-one".