538561381 has 8 divisors (see below), whose sum is σ = 562494240. Its totient is φ = 515122128.

The previous prime is 538561379. The next prime is 538561409. The reversal of 538561381 is 183165835.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 538561381 - 2¹ = 538561379 is a prime.

It is a super-2 number, since 2×538561381² = 580096722209254322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538561301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121171 + ... + 125536.

It is an arithmetic number, because the mean of its divisors is an integer number (70311780).

Almost surely, 2^538561381 is an apocalyptic number.

It is an amenable number.

538561381 is a deficient number, since it is larger than the sum of its proper divisors (23932859).

538561381 is a wasteful number, since it uses less digits than its factorization.

538561381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246803.

The product of its digits is 86400, while the sum is 40.

The square root of 538561381 is about 23206.9252810449. The cubic root of 538561381 is about 813.6014913317.

It can be divided in two parts, 5385 and 61381, that added together give a palindrome (66766).

The spelling of 538561381 in words is "five hundred thirty-eight million, five hundred sixty-one thousand, three hundred eighty-one".