2106557 has 4 divisors (see below), whose sum is σ = 2127516. Its totient is φ = 2085600.

The previous prime is 2106551. The next prime is 2106563. The reversal of 2106557 is 7556012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2106551) and next prime (2106563).

It can be written as a sum of positive squares in 2 ways, for example, as 2042041 + 64516 = 1429^2 + 254^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106557 - 2⁸ = 2106301 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106551) 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, 10328 + ... + 10529.

It is an arithmetic number, because the mean of its divisors is an integer number (531879).

2^2106557 is an apocalyptic number.

It is an amenable number.

2106557 is a deficient number, since it is larger than the sum of its proper divisors (20959).

2106557 is a wasteful number, since it uses less digits than its factorization.

2106557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20958.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 2106557 is about 1451.3982913039. The cubic root of 2106557 is about 128.1910598864.

It can be divided in two parts, 210 and 6557, that multiplied together give a triangular number (1376970 = T₁₆₅₉).

The spelling of 2106557 in words is "two million, one hundred six thousand, five hundred fifty-seven".