2156519 has 4 divisors (see below), whose sum is σ = 2270040. Its totient is φ = 2043000.

The previous prime is 2156507. The next prime is 2156521. The reversal of 2156519 is 9156512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156519 is a prime.

It is a super-2 number, since 2×2156519² = 9301148394722, 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 = 2156491 and 2156500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156599) 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, 56732 + ... + 56769.

It is an arithmetic number, because the mean of its divisors is an integer number (567510).

2^2156519 is an apocalyptic number.

2156519 is a deficient number, since it is larger than the sum of its proper divisors (113521).

2156519 is a wasteful number, since it uses less digits than its factorization.

2156519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113520.

The product of its digits is 2700, while the sum is 29.

The square root of 2156519 is about 1468.5091079050. The cubic root of 2156519 is about 129.1966034438.

The spelling of 2156519 in words is "two million, one hundred fifty-six thousand, five hundred nineteen".