538491217 has 24 divisors (see below), whose sum is σ = 627994080. Its totient is φ = 456624000.

The previous prime is 538491209. The next prime is 538491251. The reversal of 538491217 is 712194835.

It is not a de Polignac number, because 538491217 - 2³ = 538491209 is a prime.

It is a super-2 number, since 2×538491217² = 579945581572282178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 538491217.

It is not an unprimeable number, because it can be changed into a prime (538491277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3566092 + ... + 3566242.

It is an arithmetic number, because the mean of its divisors is an integer number (26166420).

Almost surely, 2^538491217 is an apocalyptic number.

It is an amenable number.

538491217 is a deficient number, since it is larger than the sum of its proper divisors (89502863).

538491217 is a wasteful number, since it uses less digits than its factorization.

538491217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 294 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 538491217 is about 23205.4135278818. The cubic root of 538491217 is about 813.5661576841.

The spelling of 538491217 in words is "five hundred thirty-eight million, four hundred ninety-one thousand, two hundred seventeen".