2131173517 has 8 divisors (see below), whose sum is σ = 2348885952. Its totient is φ = 1917456000.

The previous prime is 2131173511. The next prime is 2131173521. The reversal of 2131173517 is 7153711312.

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

It is a cyclic number.

It is not a de Polignac number, because 2131173517 - 2⁷ = 2131173389 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 (2131173511) 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, 997609 + ... + 999742.

It is an arithmetic number, because the mean of its divisors is an integer number (293610744).

Almost surely, 2^2131173517 is an apocalyptic number.

It is an amenable number.

2131173517 is a deficient number, since it is larger than the sum of its proper divisors (217712435).

2131173517 is a wasteful number, since it uses less digits than its factorization.

2131173517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997459.

The product of its digits is 4410, while the sum is 31.

The square root of 2131173517 is about 46164.6349167845. The cubic root of 2131173517 is about 1286.8845995032.

Adding to 2131173517 its reverse (7153711312), we get a palindrome (9284884829).

The spelling of 2131173517 in words is "two billion, one hundred thirty-one million, one hundred seventy-three thousand, five hundred seventeen".