2131871855 has 8 divisors (see below), whose sum is σ = 2583084192. Its totient is φ = 1688938848.

The previous prime is 2131871851. The next prime is 2131871857. The reversal of 2131871855 is 5581781312.

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 2131871855 - 2² = 2131871851 is a prime.

It is a super-2 number, since 2×2131871855² = 9089755212282282050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131871851) 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, 2069264 + ... + 2070293.

It is an arithmetic number, because the mean of its divisors is an integer number (322885524).

Almost surely, 2^2131871855 is an apocalyptic number.

2131871855 is a deficient number, since it is larger than the sum of its proper divisors (451212337).

2131871855 is a wasteful number, since it uses less digits than its factorization.

2131871855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139665.

The product of its digits is 67200, while the sum is 41.

The square root of 2131871855 is about 46172.1978575853. The cubic root of 2131871855 is about 1287.0251452743.

The spelling of 2131871855 in words is "two billion, one hundred thirty-one million, eight hundred seventy-one thousand, eight hundred fifty-five".