2156331 has 8 divisors (see below), whose sum is σ = 3044304. Its totient is φ = 1352960.

The previous prime is 2156317. The next prime is 2156339. The reversal of 2156331 is 1336512.

2156331 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 2156331 - 2⁵ = 2156299 is a prime.

It is a super-2 number, since 2×2156331² = 9299526763122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2156298 and 2156307.

It is not an unprimeable number, because it can be changed into a prime (2156339) 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, 21090 + ... + 21191.

It is an arithmetic number, because the mean of its divisors is an integer number (380538).

2^2156331 is an apocalyptic number.

2156331 is a deficient number, since it is larger than the sum of its proper divisors (887973).

2156331 is a wasteful number, since it uses less digits than its factorization.

2156331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42301.

The product of its digits is 540, while the sum is 21.

The square root of 2156331 is about 1468.4450960114. The cubic root of 2156331 is about 129.1928489877.

The spelling of 2156331 in words is "two million, one hundred fifty-six thousand, three hundred thirty-one".