985407186409 has 2 divisors, whose sum is σ = 985407186410. Its totient is φ = 985407186408.

The previous prime is 985407186371. The next prime is 985407186469. The reversal of 985407186409 is 904681704589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797220408384 + 188186778025 = 892872^2 + 433805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985407186409 is a prime.

It is not a weakly prime, because it can be changed into another prime (985407186469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492703593204 + 492703593205.

It is an arithmetic number, because the mean of its divisors is an integer number (492703593205).

Almost surely, 2^985407186409 is an apocalyptic number.

It is an amenable number.

985407186409 is a deficient number, since it is larger than the sum of its proper divisors (1).

985407186409 is an equidigital number, since it uses as much as digits as its factorization.

985407186409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 985407186409 in words is "nine hundred eighty-five billion, four hundred seven million, one hundred eighty-six thousand, four hundred nine".