2106518389 has 2 divisors, whose sum is σ = 2106518390. Its totient is φ = 2106518388.

The previous prime is 2106518371. The next prime is 2106518471. The reversal of 2106518389 is 9838156012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1967632164 + 138886225 = 44358^2 + 11785^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106518389 - 2²⁵ = 2072963957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2106518339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053259194 + 1053259195.

It is an arithmetic number, because the mean of its divisors is an integer number (1053259195).

Almost surely, 2^2106518389 is an apocalyptic number.

It is an amenable number.

2106518389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106518389 is an equidigital number, since it uses as much as digits as its factorization.

2106518389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 2106518389 is about 45896.8232996577. The cubic root of 2106518389 is about 1281.9027667864.

The spelling of 2106518389 in words is "two billion, one hundred six million, five hundred eighteen thousand, three hundred eighty-nine".