9139923509 has 2 divisors, whose sum is σ = 9139923510. Its totient is φ = 9139923508.

The previous prime is 9139923487. The next prime is 9139923553. The reversal of 9139923509 is 9053299319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8144521009 + 995402500 = 90247^2 + 31550^2 .

It is a cyclic number.

It is not a de Polignac number, because 9139923509 - 2²⁰ = 9138874933 is a prime.

It is a super-3 number, since 3×9139923509³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9139923589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569961754 + 4569961755.

It is an arithmetic number, because the mean of its divisors is an integer number (4569961755).

Almost surely, 2^9139923509 is an apocalyptic number.

It is an amenable number.

9139923509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9139923509 is an equidigital number, since it uses as much as digits as its factorization.

9139923509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 590490, while the sum is 50.

The square root of 9139923509 is about 95602.9471773752. The cubic root of 9139923509 is about 2090.8081632259.

The spelling of 9139923509 in words is "nine billion, one hundred thirty-nine million, nine hundred twenty-three thousand, five hundred nine".