2091918128831 has 8 divisors (see below), whose sum is σ = 2204912684400. Its totient is φ = 1979212933440.

The previous prime is 2091918128821. The next prime is 2091918128849. The reversal of 2091918128831 is 1388218191902.

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

It is not a de Polignac number, because 2091918128831 - 2⁶ = 2091918128767 is a prime.

It is a super-2 number, since 2×2091918128831² (a number of 25 digits) 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 (2091918128821) 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, 72325196 + ... + 72354113.

It is an arithmetic number, because the mean of its divisors is an integer number (275614085550).

Almost surely, 2^{2091918128831} is an apocalyptic number.

2091918128831 is a deficient number, since it is larger than the sum of its proper divisors (112994555569).

2091918128831 is a wasteful number, since it uses less digits than its factorization.

2091918128831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144680089.

The product of its (nonzero) digits is 497664, while the sum is 53.

The spelling of 2091918128831 in words is "two trillion, ninety-one billion, nine hundred eighteen million, one hundred twenty-eight thousand, eight hundred thirty-one".