19671217 has 2 divisors, whose sum is σ = 19671218. Its totient is φ = 19671216.

The previous prime is 19671209. The next prime is 19671229. The reversal of 19671217 is 71217691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 3381921 = 4036^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 19671217 - 2³ = 19671209 is a prime.

It is a super-2 number, since 2×19671217² = 773913556522178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19671247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9835608 + 9835609.

It is an arithmetic number, because the mean of its divisors is an integer number (9835609).

Almost surely, 2^19671217 is an apocalyptic number.

It is an amenable number.

19671217 is a deficient number, since it is larger than the sum of its proper divisors (1).

19671217 is an equidigital number, since it uses as much as digits as its factorization.

19671217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 34.

The square root of 19671217 is about 4435.2245715409. The cubic root of 19671217 is about 269.9461117877.

The spelling of 19671217 in words is "nineteen million, six hundred seventy-one thousand, two hundred seventeen".