8501772109 has 2 divisors, whose sum is σ = 8501772110. Its totient is φ = 8501772108.

The previous prime is 8501772079. The next prime is 8501772113. The reversal of 8501772109 is 9012771058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5304208900 + 3197563209 = 72830^2 + 56547^2 .

It is a cyclic number.

It is not a de Polignac number, because 8501772109 - 2⁷ = 8501771981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8501772179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4250886054 + 4250886055.

It is an arithmetic number, because the mean of its divisors is an integer number (4250886055).

Almost surely, 2^8501772109 is an apocalyptic number.

It is an amenable number.

8501772109 is a deficient number, since it is larger than the sum of its proper divisors (1).

8501772109 is an equidigital number, since it uses as much as digits as its factorization.

8501772109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 8501772109 is about 92205.0546824847. The cubic root of 8501772109 is about 2040.9693673339.

The spelling of 8501772109 in words is "eight billion, five hundred one million, seven hundred seventy-two thousand, one hundred nine".