2156549 has 4 divisors (see below), whose sum is σ = 2250336. Its totient is φ = 2062764.

The previous prime is 2156537. The next prime is 2156597. The reversal of 2156549 is 9456512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156549 is a prime.

It is a Duffinian number.

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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46859 + ... + 46904.

It is an arithmetic number, because the mean of its divisors is an integer number (562584).

2^2156549 is an apocalyptic number.

It is an amenable number.

2156549 is a deficient number, since it is larger than the sum of its proper divisors (93787).

2156549 is an equidigital number, since it uses as much as digits as its factorization.

2156549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93786.

The product of its digits is 10800, while the sum is 32.

The square root of 2156549 is about 1468.5193223107. The cubic root of 2156549 is about 129.1972025389.

The spelling of 2156549 in words is "two million, one hundred fifty-six thousand, five hundred forty-nine".