500538778391 has 2 divisors, whose sum is σ = 500538778392. Its totient is φ = 500538778390.

The previous prime is 500538778387. The next prime is 500538778403. The reversal of 500538778391 is 193877835005.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 500538778391 - 2² = 500538778387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (500538778301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250269389195 + 250269389196.

It is an arithmetic number, because the mean of its divisors is an integer number (250269389196).

Almost surely, 2^500538778391 is an apocalyptic number.

500538778391 is a deficient number, since it is larger than the sum of its proper divisors (1).

500538778391 is an equidigital number, since it uses as much as digits as its factorization.

500538778391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 500538778391 in words is "five hundred billion, five hundred thirty-eight million, seven hundred seventy-eight thousand, three hundred ninety-one".