2106551 has 2 divisors, whose sum is σ = 2106552. Its totient is φ = 2106550.

The previous prime is 2106529. The next prime is 2106563. The reversal of 2106551 is 1556012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2106551 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2106451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053275 + 1053276.

It is an arithmetic number, because the mean of its divisors is an integer number (1053276).

2^2106551 is an apocalyptic number.

2106551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106551 is an equidigital number, since it uses as much as digits as its factorization.

2106551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2106551 is about 1451.3962243302. The cubic root of 2106551 is about 128.1909381796.

The spelling of 2106551 in words is "two million, one hundred six thousand, five hundred fifty-one".