531055521 has 20 divisors (see below), whose sum is σ = 800596500. Its totient is φ = 350783136.

The previous prime is 531055471. The next prime is 531055531. The reversal of 531055521 is 125550135.

531055521 is a `hidden beast` number, since 5 + 3 + 105 + 552 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 261274896 + 269780625 = 16164^2 + 16425^2 .

It is not a de Polignac number, because 531055521 - 2⁶ = 531055457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (531055531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21246 + ... + 38903.

It is an arithmetic number, because the mean of its divisors is an integer number (40029825).

Almost surely, 2^531055521 is an apocalyptic number.

It is an amenable number.

531055521 is a deficient number, since it is larger than the sum of its proper divisors (269540979).

531055521 is a wasteful number, since it uses less digits than its factorization.

531055521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60270 (or 60261 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 531055521 is about 23044.6419152045. The cubic root of 531055521 is about 809.8041090080.

The spelling of 531055521 in words is "five hundred thirty-one million, fifty-five thousand, five hundred twenty-one".