2108554561 has 9 divisors (see below), whose sum is σ = 2156579299. Its totient is φ = 2061579424.

The previous prime is 2108554537. The next prime is 2108554571. The reversal of 2108554561 is 1654558012.

The square root of 2108554561 is 45919.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1972692225 + 135862336 = 44415^2 + 11656^2 .

It is not a de Polignac number, because 2108554561 - 2¹⁷ = 2108423489 is a prime.

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 2108554561.

It is not an unprimeable number, because it can be changed into a prime (2108554501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2157705 + ... + 2158681.

Almost surely, 2^2108554561 is an apocalyptic number.

2108554561 is the 45919-th square number.

2108554561 is the 22960-th centered octagonal number.

It is an amenable number.

2108554561 is a deficient number, since it is larger than the sum of its proper divisors (48024738).

2108554561 is an frugal number, since it uses more digits than its factorization.

2108554561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048 (or 1024 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 37.

The cubic root of 2108554561 is about 1282.3156651471.

The spelling of 2108554561 in words is "two billion, one hundred eight million, five hundred fifty-four thousand, five hundred sixty-one".