4638915509 has 4 divisors (see below), whose sum is σ = 4640750880. Its totient is φ = 4637080140.

The previous prime is 4638915499. The next prime is 4638915559. The reversal of 4638915509 is 9055198364.

It is a happy number.

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-4638915509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4638915559) 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, 913889 + ... + 918950.

It is an arithmetic number, because the mean of its divisors is an integer number (1160187720).

Almost surely, 2^4638915509 is an apocalyptic number.

It is an amenable number.

4638915509 is a deficient number, since it is larger than the sum of its proper divisors (1835371).

4638915509 is a wasteful number, since it uses less digits than its factorization.

4638915509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835370.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 4638915509 is about 68109.5845604714. The cubic root of 4638915509 is about 1667.7802280141.

The spelling of 4638915509 in words is "four billion, six hundred thirty-eight million, nine hundred fifteen thousand, five hundred nine".