2139661317 has 8 divisors (see below), whose sum is σ = 2891962624. Its totient is φ = 1406900448.

The previous prime is 2139661313. The next prime is 2139661339. The reversal of 2139661317 is 7131669312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2139661317 - 2² = 2139661313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139661313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4884853 + ... + 4885290.

It is an arithmetic number, because the mean of its divisors is an integer number (361495328).

Almost surely, 2^2139661317 is an apocalyptic number.

It is an amenable number.

2139661317 is a deficient number, since it is larger than the sum of its proper divisors (752301307).

2139661317 is an equidigital number, since it uses as much as digits as its factorization.

2139661317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9770219.

The product of its digits is 40824, while the sum is 39.

The square root of 2139661317 is about 46256.4732442931. The cubic root of 2139661317 is about 1288.5907565864.

The spelling of 2139661317 in words is "two billion, one hundred thirty-nine million, six hundred sixty-one thousand, three hundred seventeen".