1201131104861 has 2 divisors, whose sum is σ = 1201131104862. Its totient is φ = 1201131104860.

The previous prime is 1201131104857. The next prime is 1201131104881. The reversal of 1201131104861 is 1684011311021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 892335283225 + 308795821636 = 944635^2 + 555694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201131104861 - 2² = 1201131104857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201131104881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600565552430 + 600565552431.

It is an arithmetic number, because the mean of its divisors is an integer number (600565552431).

Almost surely, 2^{1201131104861} is an apocalyptic number.

It is an amenable number.

1201131104861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201131104861 is an equidigital number, since it uses as much as digits as its factorization.

1201131104861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

Adding to 1201131104861 its reverse (1684011311021), we get a palindrome (2885142415882).

The spelling of 1201131104861 in words is "one trillion, two hundred one billion, one hundred thirty-one million, one hundred four thousand, eight hundred sixty-one".