2091862881 has 16 divisors (see below), whose sum is σ = 3100009920. Its totient is φ = 1394146080.

The previous prime is 2091862859. The next prime is 2091862891. The reversal of 2091862881 is 1882681902.

It is a happy number.

2091862881 is a `hidden beast` number, since 2 + 0 + 9 + 18 + 628 + 8 + 1 = 666.

It is not a de Polignac number, because 2091862881 - 2⁵ = 2091862849 is a prime.

It is a super-2 number, since 2×2091862881² = 8751780625811240322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2091862841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94806 + ... + 114768.

It is an arithmetic number, because the mean of its divisors is an integer number (193750620).

Almost surely, 2^2091862881 is an apocalyptic number.

It is an amenable number.

2091862881 is a deficient number, since it is larger than the sum of its proper divisors (1008147039).

2091862881 is a wasteful number, since it uses less digits than its factorization.

2091862881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23853 (or 23847 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 2091862881 is about 45736.8875307448. The cubic root of 2091862881 is about 1278.9230200781.

The spelling of 2091862881 in words is "two billion, ninety-one million, eight hundred sixty-two thousand, eight hundred eighty-one".