8143939509 has 4 divisors (see below), whose sum is σ = 10858586016. Its totient is φ = 5429293004.

The previous prime is 8143939477. The next prime is 8143939513. The reversal of 8143939509 is 9059393418.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8143939509 - 2⁵ = 8143939477 is a prime.

It is a super-2 number, since 2×8143939509² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8143939519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1357323249 + ... + 1357323254.

It is an arithmetic number, because the mean of its divisors is an integer number (2714646504).

Almost surely, 2^8143939509 is an apocalyptic number.

It is an amenable number.

8143939509 is a deficient number, since it is larger than the sum of its proper divisors (2714646507).

8143939509 is a wasteful number, since it uses less digits than its factorization.

8143939509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714646506.

The product of its (nonzero) digits is 1049760, while the sum is 51.

The square root of 8143939509 is about 90243.7782287510. The cubic root of 8143939509 is about 2011.9237301414.

The spelling of 8143939509 in words is "eight billion, one hundred forty-three million, nine hundred thirty-nine thousand, five hundred nine".