15532321081 has 2 divisors, whose sum is σ = 15532321082. Its totient is φ = 15532321080.

The previous prime is 15532321027. The next prime is 15532321087. The reversal of 15532321081 is 18012323551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250062400 + 3282258681 = 110680^2 + 57291^2 .

It is a cyclic number.

It is not a de Polignac number, because 15532321081 - 2²⁵ = 15498766649 is a prime.

It is a super-2 number, since 2×15532321081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15532321087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7766160540 + 7766160541.

It is an arithmetic number, because the mean of its divisors is an integer number (7766160541).

Almost surely, 2^15532321081 is an apocalyptic number.

It is an amenable number.

15532321081 is a deficient number, since it is larger than the sum of its proper divisors (1).

15532321081 is an equidigital number, since it uses as much as digits as its factorization.

15532321081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 15532321081 in words is "fifteen billion, five hundred thirty-two million, three hundred twenty-one thousand, eighty-one".