985650109 has 2 divisors, whose sum is σ = 985650110. Its totient is φ = 985650108.

The previous prime is 985650091. The next prime is 985650167. The reversal of 985650109 is 901056589.

It is a happy number.

Together with previous prime (985650091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 984578884 + 1071225 = 31378^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 985650109 - 2¹⁵ = 985617341 is a prime.

It is a super-2 number, since 2×985650109² = 1943012274743423762, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985650409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492825054 + 492825055.

It is an arithmetic number, because the mean of its divisors is an integer number (492825055).

Almost surely, 2^985650109 is an apocalyptic number.

It is an amenable number.

985650109 is a deficient number, since it is larger than the sum of its proper divisors (1).

985650109 is an equidigital number, since it uses as much as digits as its factorization.

985650109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 985650109 is about 31395.0650421368. The cubic root of 985650109 is about 995.1936389038.

The spelling of 985650109 in words is "nine hundred eighty-five million, six hundred fifty thousand, one hundred nine".