4019678609 has 2 divisors, whose sum is σ = 4019678610. Its totient is φ = 4019678608.

The previous prime is 4019678563. The next prime is 4019678617. The reversal of 4019678609 is 9068769104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2334822400 + 1684856209 = 48320^2 + 41047^2 .

It is a cyclic number.

It is not a de Polignac number, because 4019678609 - 2¹² = 4019674513 is a prime.

It is a super-2 number, since 2×4019678609² = 32315632239304349762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4019678639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2009839304 + 2009839305.

It is an arithmetic number, because the mean of its divisors is an integer number (2009839305).

Almost surely, 2^4019678609 is an apocalyptic number.

It is an amenable number.

4019678609 is a deficient number, since it is larger than the sum of its proper divisors (1).

4019678609 is an equidigital number, since it uses as much as digits as its factorization.

4019678609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 4019678609 is about 63400.9353953079. The cubic root of 4019678609 is about 1589.9999484461. Note that the first 4 decimals are identical.

The spelling of 4019678609 in words is "four billion, nineteen million, six hundred seventy-eight thousand, six hundred nine".