2106190657 has 4 divisors (see below), whose sum is σ = 2106951876. Its totient is φ = 2105429440.

The previous prime is 2106190651. The next prime is 2106190693. The reversal of 2106190657 is 7560916012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 113550336 + 1992640321 = 10656^2 + 44639^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106190657 - 2¹⁹ = 2105666369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2106190651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376444 + ... + 381997.

It is an arithmetic number, because the mean of its divisors is an integer number (526737969).

Almost surely, 2^2106190657 is an apocalyptic number.

It is an amenable number.

2106190657 is a deficient number, since it is larger than the sum of its proper divisors (761219).

2106190657 is an equidigital number, since it uses as much as digits as its factorization.

2106190657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761218.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 2106190657 is about 45893.2528483218. The cubic root of 2106190657 is about 1281.8362838876.

The spelling of 2106190657 in words is "two billion, one hundred six million, one hundred ninety thousand, six hundred fifty-seven".