531151021 has 16 divisors (see below), whose sum is σ = 557446320. Its totient is φ = 505612800.

The previous prime is 531151013. The next prime is 531151031. The reversal of 531151021 is 120151135.

It can be written as a sum of positive squares in 8 ways, for example, as 19758025 + 511392996 = 4445^2 + 22614^2 .

It is a cyclic number.

It is not a de Polignac number, because 531151021 - 2³ = 531151013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531151021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531151031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331795 + ... + 333391.

It is an arithmetic number, because the mean of its divisors is an integer number (34840395).

Almost surely, 2^531151021 is an apocalyptic number.

It is an amenable number.

531151021 is a deficient number, since it is larger than the sum of its proper divisors (26295299).

531151021 is a wasteful number, since it uses less digits than its factorization.

531151021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 531151021 is about 23046.7138872335. The cubic root of 531151021 is about 809.8526486013.

The spelling of 531151021 in words is "five hundred thirty-one million, one hundred fifty-one thousand, twenty-one".