2156539 has 12 divisors (see below), whose sum is σ = 2737368. Its totient is φ = 1680000.

The previous prime is 2156537. The next prime is 2156597. The reversal of 2156539 is 9356512.

It is not a de Polignac number, because 2156539 - 2¹ = 2156537 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 5³ + 6 + 5³ + 3¹⁰ + 9² .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156539.

It is not an unprimeable number, because it can be changed into a prime (2156537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1462 + ... + 2539.

It is an arithmetic number, because the mean of its divisors is an integer number (228114).

2^2156539 is an apocalyptic number.

2156539 is a deficient number, since it is larger than the sum of its proper divisors (580829).

2156539 is a wasteful number, since it uses less digits than its factorization.

2156539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026 (or 4019 counting only the distinct ones).

The product of its digits is 8100, while the sum is 31.

The square root of 2156539 is about 1468.5159175167. The cubic root of 2156539 is about 129.1970028411.

It can be divided in two parts, 2156 and 539, that multiplied together give a square (1162084 = 1078²).

The spelling of 2156539 in words is "two million, one hundred fifty-six thousand, five hundred thirty-nine".