8172999361 has 2 divisors, whose sum is σ = 8172999362. Its totient is φ = 8172999360.

The previous prime is 8172999353. The next prime is 8172999391. The reversal of 8172999361 is 1639992718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7859886336 + 313113025 = 88656^2 + 17695^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172999361 - 2³ = 8172999353 is a prime.

It is not a weakly prime, because it can be changed into another prime (8172999311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086499680 + 4086499681.

It is an arithmetic number, because the mean of its divisors is an integer number (4086499681).

Almost surely, 2^8172999361 is an apocalyptic number.

It is an amenable number.

8172999361 is a deficient number, since it is larger than the sum of its proper divisors (1).

8172999361 is an equidigital number, since it uses as much as digits as its factorization.

8172999361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The square root of 8172999361 is about 90404.6423642061. The cubic root of 8172999361 is about 2014.3139247986.

The spelling of 8172999361 in words is "eight billion, one hundred seventy-two million, nine hundred ninety-nine thousand, three hundred sixty-one".