15947212481 has 2 divisors, whose sum is σ = 15947212482. Its totient is φ = 15947212480.

The previous prime is 15947212447. The next prime is 15947212543. The reversal of 15947212481 is 18421274951.

It is a happy number.

15947212481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11375289025 + 4571923456 = 106655^2 + 67616^2 .

It is a cyclic number.

It is not a de Polignac number, because 15947212481 - 2¹⁸ = 15946950337 is a prime.

It is a super-2 number, since 2×15947212481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15947211481) 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, 7973606240 + 7973606241.

It is an arithmetic number, because the mean of its divisors is an integer number (7973606241).

Almost surely, 2^15947212481 is an apocalyptic number.

It is an amenable number.

15947212481 is a deficient number, since it is larger than the sum of its proper divisors (1).

15947212481 is an equidigital number, since it uses as much as digits as its factorization.

15947212481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The spelling of 15947212481 in words is "fifteen billion, nine hundred forty-seven million, two hundred twelve thousand, four hundred eighty-one".