538131931 has 4 divisors (see below), whose sum is σ = 538180000. Its totient is φ = 538083864.

The previous prime is 538131871. The next prime is 538131941. The reversal of 538131931 is 139131835.

538131931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 139131835 = 5 ⋅27826367.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-538131931 is a prime.

It is a super-2 number, since 2×538131931² = 579171950323577522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538131941) 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, 2590 + ... + 32908.

It is an arithmetic number, because the mean of its divisors is an integer number (134545000).

Almost surely, 2^538131931 is an apocalyptic number.

538131931 is a deficient number, since it is larger than the sum of its proper divisors (48069).

538131931 is a wasteful number, since it uses less digits than its factorization.

538131931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48068.

The product of its digits is 9720, while the sum is 34.

The square root of 538131931 is about 23197.6708098033. The cubic root of 538131931 is about 813.3851779674.

The spelling of 538131931 in words is "five hundred thirty-eight million, one hundred thirty-one thousand, nine hundred thirty-one".