217594490401 has 4 divisors (see below), whose sum is σ = 223475422612. Its totient is φ = 211713558192.

The previous prime is 217594490371. The next prime is 217594490417. The reversal of 217594490401 is 104094495712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82059331600 + 135535158801 = 286460^2 + 368151^2 .

It is a cyclic number.

It is not a de Polignac number, because 217594490401 - 2¹⁷ = 217594359329 is a prime.

It is a super-2 number, since 2×217594490401² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217594493401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2940466050 + ... + 2940466123.

It is an arithmetic number, because the mean of its divisors is an integer number (55868855653).

Almost surely, 2^217594490401 is an apocalyptic number.

It is an amenable number.

217594490401 is a deficient number, since it is larger than the sum of its proper divisors (5880932211).

217594490401 is an equidigital number, since it uses as much as digits as its factorization.

217594490401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5880932210.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 217594490401 in words is "two hundred seventeen billion, five hundred ninety-four million, four hundred ninety thousand, four hundred one".