8172137489 has 2 divisors, whose sum is σ = 8172137490. Its totient is φ = 8172137488.

The previous prime is 8172137459. The next prime is 8172137539. The reversal of 8172137489 is 9847312718.

It is a happy number.

It is an a-pointer prime, because the next prime (8172137539) can be obtained adding 8172137489 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8152645264 + 19492225 = 90292^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172137489 - 2¹⁶ = 8172071953 is a prime.

It is a super-3 number, since 3×8172137489³ (a number of 31 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 (8172137459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086068744 + 4086068745.

It is an arithmetic number, because the mean of its divisors is an integer number (4086068745).

Almost surely, 2^8172137489 is an apocalyptic number.

It is an amenable number.

8172137489 is a deficient number, since it is larger than the sum of its proper divisors (1).

8172137489 is an equidigital number, since it uses as much as digits as its factorization.

8172137489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 8172137489 is about 90399.8754921709. The cubic root of 8172137489 is about 2014.2431167748.

The spelling of 8172137489 in words is "eight billion, one hundred seventy-two million, one hundred thirty-seven thousand, four hundred eighty-nine".