1201305923149 has 2 divisors, whose sum is σ = 1201305923150. Its totient is φ = 1201305923148.

The previous prime is 1201305923143. The next prime is 1201305923221. The reversal of 1201305923149 is 9413295031021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 853070209924 + 348235713225 = 923618^2 + 590115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201305923149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201305923143) 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, 600652961574 + 600652961575.

It is an arithmetic number, because the mean of its divisors is an integer number (600652961575).

Almost surely, 2^{1201305923149} is an apocalyptic number.

It is an amenable number.

1201305923149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201305923149 is an equidigital number, since it uses as much as digits as its factorization.

1201305923149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 1201305923149 in words is "one trillion, two hundred one billion, three hundred five million, nine hundred twenty-three thousand, one hundred forty-nine".