8131225189 has 2 divisors, whose sum is σ = 8131225190. Its totient is φ = 8131225188.

The previous prime is 8131225187. The next prime is 8131225303. The reversal of 8131225189 is 9815221318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6862796964 + 1268428225 = 82842^2 + 35615^2 .

It is a cyclic number.

It is not a de Polignac number, because 8131225189 - 2¹ = 8131225187 is a prime.

It is a super-2 number, since 2×8131225189² (a number of 21 digits) contains 22 as substring.

Together with 8131225187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8131225183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4065612594 + 4065612595.

It is an arithmetic number, because the mean of its divisors is an integer number (4065612595).

Almost surely, 2^8131225189 is an apocalyptic number.

It is an amenable number.

8131225189 is a deficient number, since it is larger than the sum of its proper divisors (1).

8131225189 is an equidigital number, since it uses as much as digits as its factorization.

8131225189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 40.

The square root of 8131225189 is about 90173.3064104894. The cubic root of 8131225189 is about 2010.8761795626.

The spelling of 8131225189 in words is "eight billion, one hundred thirty-one million, two hundred twenty-five thousand, one hundred eighty-nine".