5238730991 has 4 divisors (see below), whose sum is σ = 5641710312. Its totient is φ = 4835751672.

The previous prime is 5238730961. The next prime is 5238731023. The reversal of 5238730991 is 1990378325.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5238730991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5238730961) 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, 201489641 + ... + 201489666.

It is an arithmetic number, because the mean of its divisors is an integer number (1410427578).

Almost surely, 2^5238730991 is an apocalyptic number.

5238730991 is a deficient number, since it is larger than the sum of its proper divisors (402979321).

5238730991 is a wasteful number, since it uses less digits than its factorization.

5238730991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402979320.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 5238730991 is about 72379.0784066777. The cubic root of 5238730991 is about 1736.7688959084.

The spelling of 5238730991 in words is "five billion, two hundred thirty-eight million, seven hundred thirty thousand, nine hundred ninety-one".