52531821 has 20 divisors (see below), whose sum is σ = 78892000. Its totient is φ = 34834536.

The previous prime is 52531781. The next prime is 52531837. The reversal of 52531821 is 12813525.

It is a happy number.

52531821 is a `hidden beast` number, since 52 + 531 + 82 + 1 = 666.

It is not a de Polignac number, because 52531821 - 2¹⁸ = 52269677 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52531861) 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, 14490 + ... + 17748.

It is an arithmetic number, because the mean of its divisors is an integer number (3944600).

Almost surely, 2^52531821 is an apocalyptic number.

It is an amenable number.

52531821 is a deficient number, since it is larger than the sum of its proper divisors (26360179).

52531821 is a wasteful number, since it uses less digits than its factorization.

52531821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3470 (or 3461 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 52531821 is about 7247.8838980767. The cubic root of 52531821 is about 374.5192559571.

The spelling of 52531821 in words is "fifty-two million, five hundred thirty-one thousand, eight hundred twenty-one".