8501427989 has 2 divisors, whose sum is σ = 8501427990. Its totient is φ = 8501427988.

The previous prime is 8501427971. The next prime is 8501428031. The reversal of 8501427989 is 9897241058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6884020900 + 1617407089 = 82970^2 + 40217^2 .

It is a cyclic number.

It is not a de Polignac number, because 8501427989 - 2¹⁶ = 8501362453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8501427989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8501427919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4250713994 + 4250713995.

It is an arithmetic number, because the mean of its divisors is an integer number (4250713995).

Almost surely, 2^8501427989 is an apocalyptic number.

It is an amenable number.

8501427989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8501427989 is an equidigital number, since it uses as much as digits as its factorization.

8501427989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The square root of 8501427989 is about 92203.1886053839. The cubic root of 8501427989 is about 2040.9418300218.

The spelling of 8501427989 in words is "eight billion, five hundred one million, four hundred twenty-seven thousand, nine hundred eighty-nine".