15971331361 has 2 divisors, whose sum is σ = 15971331362. Its totient is φ = 15971331360.

The previous prime is 15971331349. The next prime is 15971331371. The reversal of 15971331361 is 16313317951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12894965136 + 3076366225 = 113556^2 + 55465^2 .

It is a cyclic number.

It is not a de Polignac number, because 15971331361 - 2³³ = 7381396769 is a prime.

It is a super-3 number, since 3×15971331361³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (15971331301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7985665680 + 7985665681.

It is an arithmetic number, because the mean of its divisors is an integer number (7985665681).

Almost surely, 2^15971331361 is an apocalyptic number.

It is an amenable number.

15971331361 is a deficient number, since it is larger than the sum of its proper divisors (1).

15971331361 is an equidigital number, since it uses as much as digits as its factorization.

15971331361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 40.

The spelling of 15971331361 in words is "fifteen billion, nine hundred seventy-one million, three hundred thirty-one thousand, three hundred sixty-one".