531348021 has 6 divisors (see below), whose sum is σ = 767502710. Its totient is φ = 354232008.

The previous prime is 531348017. The next prime is 531348031. The reversal of 531348021 is 120843135.

It is a happy number.

531348021 is a `hidden beast` number, since 531 + 34 + 80 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 356076900 + 175271121 = 18870^2 + 13239^2 .

It is not a de Polignac number, because 531348021 - 2² = 531348017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531348031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29519326 + ... + 29519343.

Almost surely, 2^531348021 is an apocalyptic number.

It is an amenable number.

531348021 is a deficient number, since it is larger than the sum of its proper divisors (236154689).

531348021 is a wasteful number, since it uses less digits than its factorization.

531348021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59038675 (or 59038672 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 531348021 is about 23050.9874191975. The cubic root of 531348021 is about 809.9527590190.

The spelling of 531348021 in words is "five hundred thirty-one million, three hundred forty-eight thousand, twenty-one".