506531421 has 16 divisors (see below), whose sum is σ = 818637120. Its totient is φ = 306988560.

The previous prime is 506531419. The next prime is 506531423. The reversal of 506531421 is 124135605.

506531421 is a `hidden beast` number, since 5 + 0 + 653 + 1 + 4 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (506531419) and next prime (506531423).

It is not a de Polignac number, because 506531421 - 2¹ = 506531419 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506531423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852450 + ... + 853043.

It is an arithmetic number, because the mean of its divisors is an integer number (51164820).

Almost surely, 2^506531421 is an apocalyptic number.

It is an amenable number.

506531421 is a deficient number, since it is larger than the sum of its proper divisors (312105699).

506531421 is a wasteful number, since it uses less digits than its factorization.

506531421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705513 (or 1705507 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 506531421 is about 22506.2529311301. The cubic root of 506531421 is about 797.1415807340.

The spelling of 506531421 in words is "five hundred six million, five hundred thirty-one thousand, four hundred twenty-one".