2105551 has 12 divisors (see below), whose sum is σ = 2494416. Its totient is φ = 1740960.

The previous prime is 2105549. The next prime is 2105557. The reversal of 2105551 is 1555012.

It is not a de Polignac number, because 2105551 - 2¹ = 2105549 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 (2105557) 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, 6571 + ... + 6883.

It is an arithmetic number, because the mean of its divisors is an integer number (207868).

2^2105551 is an apocalyptic number.

2105551 is a deficient number, since it is larger than the sum of its proper divisors (388865).

2105551 is an equidigital number, since it uses as much as digits as its factorization.

2105551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 2105551 is about 1451.0516875701. The cubic root of 2105551 is about 128.1706504790.

The spelling of 2105551 in words is "two million, one hundred five thousand, five hundred fifty-one".