2109006857 has 2 divisors, whose sum is σ = 2109006858. Its totient is φ = 2109006856.

The previous prime is 2109006847. The next prime is 2109006929. The reversal of 2109006857 is 7586009012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1626589561 + 482417296 = 40331^2 + 21964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109006857 - 2¹² = 2109002761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2109006857.

It is not a weakly prime, because it can be changed into another prime (2109006847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054503428 + 1054503429.

It is an arithmetic number, because the mean of its divisors is an integer number (1054503429).

Almost surely, 2^2109006857 is an apocalyptic number.

It is an amenable number.

2109006857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109006857 is an equidigital number, since it uses as much as digits as its factorization.

2109006857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 2109006857 is about 45923.9246689566. The cubic root of 2109006857 is about 1282.4073464015.

The spelling of 2109006857 in words is "two billion, one hundred nine million, six thousand, eight hundred fifty-seven".