1215551328029 has 2 divisors, whose sum is σ = 1215551328030. Its totient is φ = 1215551328028.

The previous prime is 1215551328007. The next prime is 1215551328031. The reversal of 1215551328029 is 9208231555121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1134389015929 + 81162312100 = 1065077^2 + 284890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215551328029 is a prime.

It is a super-2 number, since 2×1215551328029² (a number of 25 digits) contains 22 as substring.

Together with 1215551328031, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215556328029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607775664014 + 607775664015.

It is an arithmetic number, because the mean of its divisors is an integer number (607775664015).

Almost surely, 2^{1215551328029} is an apocalyptic number.

It is an amenable number.

1215551328029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215551328029 is an equidigital number, since it uses as much as digits as its factorization.

1215551328029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216000, while the sum is 44.

The spelling of 1215551328029 in words is "one trillion, two hundred fifteen billion, five hundred fifty-one million, three hundred twenty-eight thousand, twenty-nine".