1311421600061 has 2 divisors, whose sum is σ = 1311421600062. Its totient is φ = 1311421600060.

The previous prime is 1311421600043. The next prime is 1311421600087. The reversal of 1311421600061 is 1600061241131.

It is an a-pointer prime, because the next prime (1311421600087) can be obtained adding 1311421600061 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1255786943161 + 55634656900 = 1120619^2 + 235870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311421600061 - 2⁶ = 1311421599997 is a prime.

It is a super-2 number, since 2×1311421600061² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1311421600061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311421600261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655710800030 + 655710800031.

It is an arithmetic number, because the mean of its divisors is an integer number (655710800031).

Almost surely, 2^{1311421600061} is an apocalyptic number.

It is an amenable number.

1311421600061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311421600061 is an equidigital number, since it uses as much as digits as its factorization.

1311421600061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 1311421600061 its reverse (1600061241131), we get a palindrome (2911482841192).

The spelling of 1311421600061 in words is "one trillion, three hundred eleven billion, four hundred twenty-one million, six hundred thousand, sixty-one".