8428040861 has 2 divisors, whose sum is σ = 8428040862. Its totient is φ = 8428040860.

The previous prime is 8428040851. The next prime is 8428040911. The reversal of 8428040861 is 1680408248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6147500836 + 2280540025 = 78406^2 + 47755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8428040861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8428040851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4214020430 + 4214020431.

It is an arithmetic number, because the mean of its divisors is an integer number (4214020431).

Almost surely, 2^8428040861 is an apocalyptic number.

It is an amenable number.

8428040861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8428040861 is an equidigital number, since it uses as much as digits as its factorization.

8428040861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98304, while the sum is 41.

The square root of 8428040861 is about 91804.3618843898. The cubic root of 8428040861 is about 2035.0521560161.

The spelling of 8428040861 in words is "eight billion, four hundred twenty-eight million, forty thousand, eight hundred sixty-one".