538533531 has 24 divisors (see below), whose sum is σ = 829202400. Its totient is φ = 335621376.

The previous prime is 538533529. The next prime is 538533551. The reversal of 538533531 is 135335835.

It is a happy number.

It is not a de Polignac number, because 538533531 - 2¹ = 538533529 is a prime.

It is a super-2 number, since 2×538533531² = 580036728022655922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (538533521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10986 + ... + 34608.

It is an arithmetic number, because the mean of its divisors is an integer number (34550100).

Almost surely, 2^538533531 is an apocalyptic number.

538533531 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

538533531 is a deficient number, since it is larger than the sum of its proper divisors (290668869).

538533531 is a wasteful number, since it uses less digits than its factorization.

538533531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23795 (or 23792 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 538533531 is about 23206.3252368832. The cubic root of 538533531 is about 813.5874668133.

The spelling of 538533531 in words is "five hundred thirty-eight million, five hundred thirty-three thousand, five hundred thirty-one".