398109196217 has 2 divisors, whose sum is σ = 398109196218. Its totient is φ = 398109196216.

The previous prime is 398109196211. The next prime is 398109196237. The reversal of 398109196217 is 712691901893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 351994210681 + 46114985536 = 593291^2 + 214744^2 .

It is a cyclic number.

It is not a de Polignac number, because 398109196217 - 2¹⁸ = 398108934073 is a prime.

It is a super-2 number, since 2×398109196217² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398109196211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199054598108 + 199054598109.

It is an arithmetic number, because the mean of its divisors is an integer number (199054598109).

Almost surely, 2^398109196217 is an apocalyptic number.

It is an amenable number.

398109196217 is a deficient number, since it is larger than the sum of its proper divisors (1).

398109196217 is an equidigital number, since it uses as much as digits as its factorization.

398109196217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The spelling of 398109196217 in words is "three hundred ninety-eight billion, one hundred nine million, one hundred ninety-six thousand, two hundred seventeen".