9151398536221 has 2 divisors, whose sum is σ = 9151398536222. Its totient is φ = 9151398536220.

The previous prime is 9151398536209. The next prime is 9151398536233. The reversal of 9151398536221 is 1226358931519.

It is a balanced prime because it is at equal distance from previous prime (9151398536209) and next prime (9151398536233).

It can be written as a sum of positive squares in only one way, i.e., 7839938400121 + 1311460136100 = 2799989^2 + 1145190^2 .

It is a cyclic number.

It is not a de Polignac number, because 9151398536221 - 2¹⁵ = 9151398503453 is a prime.

It is a super-3 number, since 3×9151398536221³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9151398536261) 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, 4575699268110 + 4575699268111.

It is an arithmetic number, because the mean of its divisors is an integer number (4575699268111).

Almost surely, 2^{9151398536221} is an apocalyptic number.

It is an amenable number.

9151398536221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9151398536221 is an equidigital number, since it uses as much as digits as its factorization.

9151398536221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3499200, while the sum is 55.

The spelling of 9151398536221 in words is "nine trillion, one hundred fifty-one billion, three hundred ninety-eight million, five hundred thirty-six thousand, two hundred twenty-one".