2156523 has 4 divisors (see below), whose sum is σ = 2875368. Its totient is φ = 1437680.

The previous prime is 2156521. The next prime is 2156537. The reversal of 2156523 is 3256512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2156523 - 2¹ = 2156521 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 2156493 and 2156502.

It is not an unprimeable number, because it can be changed into a prime (2156521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359418 + ... + 359423.

It is an arithmetic number, because the mean of its divisors is an integer number (718842).

2^2156523 is an apocalyptic number.

2156523 is a deficient number, since it is larger than the sum of its proper divisors (718845).

2156523 is an equidigital number, since it uses as much as digits as its factorization.

2156523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718844.

The product of its digits is 1800, while the sum is 24.

The square root of 2156523 is about 1468.5104698299. The cubic root of 2156523 is about 129.1966833234.

The spelling of 2156523 in words is "two million, one hundred fifty-six thousand, five hundred twenty-three".