999109061 has 2 divisors, whose sum is σ = 999109062. Its totient is φ = 999109060.

The previous prime is 999109043. The next prime is 999109087. The reversal of 999109061 is 160901999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 921122500 + 77986561 = 30350^2 + 8831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999109061 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 (999109961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499554530 + 499554531.

It is an arithmetic number, because the mean of its divisors is an integer number (499554531).

Almost surely, 2^999109061 is an apocalyptic number.

It is an amenable number.

999109061 is a deficient number, since it is larger than the sum of its proper divisors (1).

999109061 is an equidigital number, since it uses as much as digits as its factorization.

999109061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 999109061 is about 31608.6864801434. The cubic root of 999109061 is about 999.7029320927.

The spelling of 999109061 in words is "nine hundred ninety-nine million, one hundred nine thousand, sixty-one".