538469991 has 16 divisors (see below), whose sum is σ = 819295200. Its totient is φ = 349277184.

The previous prime is 538469977. The next prime is 538470007. The reversal of 538469991 is 199964835.

It is not a de Polignac number, because 538469991 - 2⁵ = 538469959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538469791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268506 + ... + 270503.

It is an arithmetic number, because the mean of its divisors is an integer number (51205950).

Almost surely, 2^538469991 is an apocalyptic number.

538469991 is a deficient number, since it is larger than the sum of its proper divisors (280825209).

538469991 is a wasteful number, since it uses less digits than its factorization.

538469991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539055 (or 539049 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 538469991 is about 23204.9561731971. The cubic root of 538469991 is about 813.5554679510. Note that the first 3 decimals are identical.

The spelling of 538469991 in words is "five hundred thirty-eight million, four hundred sixty-nine thousand, nine hundred ninety-one".