1215405225149 has 2 divisors, whose sum is σ = 1215405225150. Its totient is φ = 1215405225148.

The previous prime is 1215405225113. The next prime is 1215405225173. The reversal of 1215405225149 is 9415225045121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 890069599225 + 325335625924 = 943435^2 + 570382^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215405225149 - 2²⁸ = 1215136789693 is a prime.

It is a super-2 number, since 2×1215405225149² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215405225179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607702612574 + 607702612575.

It is an arithmetic number, because the mean of its divisors is an integer number (607702612575).

Almost surely, 2^{1215405225149} is an apocalyptic number.

It is an amenable number.

1215405225149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215405225149 is an equidigital number, since it uses as much as digits as its factorization.

1215405225149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 1215405225149 in words is "one trillion, two hundred fifteen billion, four hundred five million, two hundred twenty-five thousand, one hundred forty-nine".