2131819817 has 8 divisors (see below), whose sum is σ = 2247096960. Its totient is φ = 2016850320.

The previous prime is 2131819799. The next prime is 2131819867. The reversal of 2131819817 is 7189181312.

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 2131819817 - 2²⁸ = 1863384361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131819867) 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, 62609 + ... + 90462.

It is an arithmetic number, because the mean of its divisors is an integer number (280887120).

Almost surely, 2^2131819817 is an apocalyptic number.

It is an amenable number.

2131819817 is a deficient number, since it is larger than the sum of its proper divisors (115277143).

2131819817 is a wasteful number, since it uses less digits than its factorization.

2131819817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153823.

The product of its digits is 24192, while the sum is 41.

The square root of 2131819817 is about 46171.6343332137. The cubic root of 2131819817 is about 1287.0146732942.

The spelling of 2131819817 in words is "two billion, one hundred thirty-one million, eight hundred nineteen thousand, eight hundred seventeen".