2131855 has 16 divisors (see below), whose sum is σ = 2830464. Its totient is φ = 1528480.

The previous prime is 2131853. The next prime is 2131859. The reversal of 2131855 is 5581312.

It is a happy number.

It is not a de Polignac number, because 2131855 - 2¹ = 2131853 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 (2131853) 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, 4332 + ... + 4798.

It is an arithmetic number, because the mean of its divisors is an integer number (176904).

2^2131855 is an apocalyptic number.

2131855 is a deficient number, since it is larger than the sum of its proper divisors (698609).

2131855 is a wasteful number, since it uses less digits than its factorization.

2131855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566.

The product of its digits is 1200, while the sum is 25.

The square root of 2131855 is about 1460.0873261555. The cubic root of 2131855 is about 128.7021753440.

The spelling of 2131855 in words is "two million, one hundred thirty-one thousand, eight hundred fifty-five".