619441409 has 4 divisors (see below), whose sum is σ = 620768304. Its totient is φ = 618114516.

The previous prime is 619441391. The next prime is 619441447. The reversal of 619441409 is 904144916.

619441409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-619441409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (619441499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662747 + ... + 663680.

It is an arithmetic number, because the mean of its divisors is an integer number (155192076).

Almost surely, 2^619441409 is an apocalyptic number.

It is an amenable number.

619441409 is a deficient number, since it is larger than the sum of its proper divisors (1326895).

619441409 is a wasteful number, since it uses less digits than its factorization.

619441409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326894.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 619441409 is about 24888.5798911870. The cubic root of 619441409 is about 852.4457398752.

The spelling of 619441409 in words is "six hundred nineteen million, four hundred forty-one thousand, four hundred nine".