2108205551 has 4 divisors (see below), whose sum is σ = 2108305704. Its totient is φ = 2108105400.

The previous prime is 2108205503. The next prime is 2108205557. The reversal of 2108205551 is 1555028012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2108205551 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 (2108205557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4940 + ... + 65121.

It is an arithmetic number, because the mean of its divisors is an integer number (527076426).

Almost surely, 2^2108205551 is an apocalyptic number.

2108205551 is a deficient number, since it is larger than the sum of its proper divisors (100153).

2108205551 is an equidigital number, since it uses as much as digits as its factorization.

2108205551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100152.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 2108205551 is about 45915.1995639788. The cubic root of 2108205551 is about 1282.2449111982.

The spelling of 2108205551 in words is "two billion, one hundred eight million, two hundred five thousand, five hundred fifty-one".