538513631 has 4 divisors (see below), whose sum is σ = 540057000. Its totient is φ = 536970264.

The previous prime is 538513603. The next prime is 538513643. The reversal of 538513631 is 136315835.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 538513631 - 2¹⁸ = 538251487 is a prime.

It is a super-2 number, since 2×538513631² = 579993861545608322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 538513591 and 538513600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538513601) 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, 771161 + ... + 771858.

It is an arithmetic number, because the mean of its divisors is an integer number (135014250).

Almost surely, 2^538513631 is an apocalyptic number.

538513631 is a deficient number, since it is larger than the sum of its proper divisors (1543369).

538513631 is a wasteful number, since it uses less digits than its factorization.

538513631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543368.

The product of its digits is 32400, while the sum is 35.

The square root of 538513631 is about 23205.8964705094. The cubic root of 538513631 is about 813.5774454069.

The spelling of 538513631 in words is "five hundred thirty-eight million, five hundred thirteen thousand, six hundred thirty-one".