2155831 has 8 divisors (see below), whose sum is σ = 2260800. Its totient is φ = 2052960.

The previous prime is 2155799. The next prime is 2155837. The reversal of 2155831 is 1385512.

It is a happy number.

2155831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2155831 - 2⁵ = 2155799 is a prime.

It is a super-2 number, since 2×2155831² = 9295214601122, which contains 22 as substring.

It is a Duffinian number.

2155831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2155796 and 2155805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1821 + ... + 2761.

It is an arithmetic number, because the mean of its divisors is an integer number (282600).

2^2155831 is an apocalyptic number.

2155831 is a deficient number, since it is larger than the sum of its proper divisors (104969).

2155831 is an equidigital number, since it uses as much as digits as its factorization.

2155831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049.

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

The square root of 2155831 is about 1468.2748380327. The cubic root of 2155831 is about 129.1828626702.

The spelling of 2155831 in words is "two million, one hundred fifty-five thousand, eight hundred thirty-one".