2106809587 has 2 divisors, whose sum is σ = 2106809588. Its totient is φ = 2106809586.

The previous prime is 2106809581. The next prime is 2106809633. The reversal of 2106809587 is 7859086012.

It is an a-pointer prime, because the next prime (2106809633) can be obtained adding 2106809587 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2106809587 - 2¹¹ = 2106807539 is a prime.

It is a super-2 number, since 2×2106809587² = 8877293271750221138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2106809581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053404793 + 1053404794.

It is an arithmetic number, because the mean of its divisors is an integer number (1053404794).

Almost surely, 2^2106809587 is an apocalyptic number.

2106809587 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106809587 is an equidigital number, since it uses as much as digits as its factorization.

2106809587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 2106809587 is about 45899.9955010891. The cubic root of 2106809587 is about 1281.9618327037.

The spelling of 2106809587 in words is "two billion, one hundred six million, eight hundred nine thousand, five hundred eighty-seven".