2155231 has 8 divisors (see below), whose sum is σ = 2335760. Its totient is φ = 1976832.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155231 is 1325512.

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

It is not a de Polignac number, because 2155231 - 2⁷ = 2155103 is a prime.

It is a super-2 number, since 2×2155231² = 9290041326722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2155199 and 2155208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155201) 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, 2080 + ... + 2938.

It is an arithmetic number, because the mean of its divisors is an integer number (291970).

2^2155231 is an apocalyptic number.

2155231 is a deficient number, since it is larger than the sum of its proper divisors (180529).

2155231 is a wasteful number, since it uses less digits than its factorization.

2155231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065.

The product of its digits is 300, while the sum is 19.

The square root of 2155231 is about 1468.0705023942. The cubic root of 2155231 is about 129.1708770509.

The spelling of 2155231 in words is "two million, one hundred fifty-five thousand, two hundred thirty-one".