985963861 has 2 divisors, whose sum is σ = 985963862. Its totient is φ = 985963860.

The previous prime is 985963757. The next prime is 985963871. The reversal of 985963861 is 168369589.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707240836 + 278723025 = 26594^2 + 16695^2 .

It is a cyclic number.

It is not a de Polignac number, because 985963861 - 2⁷ = 985963733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985963871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492981930 + 492981931.

It is an arithmetic number, because the mean of its divisors is an integer number (492981931).

Almost surely, 2^985963861 is an apocalyptic number.

It is an amenable number.

985963861 is a deficient number, since it is larger than the sum of its proper divisors (1).

985963861 is an equidigital number, since it uses as much as digits as its factorization.

985963861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 55.

The square root of 985963861 is about 31400.0614808315. The cubic root of 985963861 is about 995.2992243329.

The spelling of 985963861 in words is "nine hundred eighty-five million, nine hundred sixty-three thousand, eight hundred sixty-one".