1670409217 has 4 divisors (see below), whose sum is σ = 1670895040. Its totient is φ = 1669923396.

The previous prime is 1670409211. The next prime is 1670409229. The reversal of 1670409217 is 7129040761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7129040761 = 20101 ⋅354661.

It is a cyclic number.

It is not a de Polignac number, because 1670409217 - 2¹⁹ = 1669884929 is a prime.

It is a super-3 number, since 3×1670409217³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1670409211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237717 + ... + 244642.

It is an arithmetic number, because the mean of its divisors is an integer number (417723760).

Almost surely, 2^1670409217 is an apocalyptic number.

It is an amenable number.

1670409217 is a deficient number, since it is larger than the sum of its proper divisors (485823).

1670409217 is an equidigital number, since it uses as much as digits as its factorization.

1670409217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485822.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 1670409217 is about 40870.6400365837. The cubic root of 1670409217 is about 1186.5178948686.

Adding to 1670409217 its reverse (7129040761), we get a palindrome (8799449978).

The spelling of 1670409217 in words is "one billion, six hundred seventy million, four hundred nine thousand, two hundred seventeen".