2170847846989 has 2 divisors, whose sum is σ = 2170847846990. Its totient is φ = 2170847846988.

The previous prime is 2170847846987. The next prime is 2170847847001. The reversal of 2170847846989 is 9896487480712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2130067275625 + 40780571364 = 1459475^2 + 201942^2 .

It is a cyclic number.

It is not a de Polignac number, because 2170847846989 - 2¹ = 2170847846987 is a prime.

It is a super-2 number, since 2×2170847846989² (a number of 25 digits) contains 22 as substring.

Together with 2170847846987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2170847846987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085423923494 + 1085423923495.

It is an arithmetic number, because the mean of its divisors is an integer number (1085423923495).

Almost surely, 2^{2170847846989} is an apocalyptic number.

It is an amenable number.

2170847846989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170847846989 is an equidigital number, since it uses as much as digits as its factorization.

2170847846989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 390168576, while the sum is 73.

The spelling of 2170847846989 in words is "two trillion, one hundred seventy billion, eight hundred forty-seven million, eight hundred forty-six thousand, nine hundred eighty-nine".