2155331 has 4 divisors (see below), whose sum is σ = 2158464. Its totient is φ = 2152200.

The previous prime is 2155327. The next prime is 2155333. The reversal of 2155331 is 1335512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2155331 - 2² = 2155327 is a prime.

It is a super-2 number, since 2×2155331² = 9290903439122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 2076.

It is an arithmetic number, because the mean of its divisors is an integer number (539616).

2^2155331 is an apocalyptic number.

2155331 is a deficient number, since it is larger than the sum of its proper divisors (3133).

2155331 is a wasteful number, since it uses less digits than its factorization.

2155331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132.

The product of its digits is 450, while the sum is 20.

The square root of 2155331 is about 1468.1045603090. The cubic root of 2155331 is about 129.1728748086.

The spelling of 2155331 in words is "two million, one hundred fifty-five thousand, three hundred thirty-one".