538385591 has 4 divisors (see below), whose sum is σ = 538442184. Its totient is φ = 538329000.

The previous prime is 538385581. The next prime is 538385621. The reversal of 538385591 is 195583835.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 538385591 - 2¹⁴ = 538369207 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 (538385581) 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, 10145 + ... + 34346.

It is an arithmetic number, because the mean of its divisors is an integer number (134610546).

Almost surely, 2^538385591 is an apocalyptic number.

538385591 is a deficient number, since it is larger than the sum of its proper divisors (56593).

538385591 is a wasteful number, since it uses less digits than its factorization.

538385591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56592.

The product of its digits is 648000, while the sum is 47.

The square root of 538385591 is about 23203.1375249124. The cubic root of 538385591 is about 813.5129600610.

The spelling of 538385591 in words is "five hundred thirty-eight million, three hundred eighty-five thousand, five hundred ninety-one".