2102809556 has 24 divisors (see below), whose sum is σ = 3802184064. Its totient is φ = 1017030560.

The previous prime is 2102809531. The next prime is 2102809559. The reversal of 2102809556 is 6559082012.

It is a super-3 number, since 3×2102809556³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102809559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54800 + ... + 84903.

It is an arithmetic number, because the mean of its divisors is an integer number (158424336).

Almost surely, 2^2102809556 is an apocalyptic number.

It is an amenable number.

2102809556 is a deficient number, since it is larger than the sum of its proper divisors (1699374508).

2102809556 is a wasteful number, since it uses less digits than its factorization.

2102809556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139831 (or 139829 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 2102809556 is about 45856.4014724226. The cubic root of 2102809556 is about 1281.1499992037.

The spelling of 2102809556 in words is "two billion, one hundred two million, eight hundred nine thousand, five hundred fifty-six".