531045021 has 8 divisors (see below), whose sum is σ = 762526240. Its totient is φ = 326796912.

The previous prime is 531045019. The next prime is 531045023. The reversal of 531045021 is 120540135.

It is an interprime number because it is at equal distance from previous prime (531045019) and next prime (531045023).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 531045021 - 2¹ = 531045019 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 (531045023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6808231 + ... + 6808308.

It is an arithmetic number, because the mean of its divisors is an integer number (95315780).

Almost surely, 2^531045021 is an apocalyptic number.

It is an amenable number.

531045021 is a deficient number, since it is larger than the sum of its proper divisors (231481219).

531045021 is a wasteful number, since it uses less digits than its factorization.

531045021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13616555.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 531045021 is about 23044.4140953941. The cubic root of 531045021 is about 809.7987718390.

Adding to 531045021 its reverse (120540135), we get a palindrome (651585156).

The spelling of 531045021 in words is "five hundred thirty-one million, forty-five thousand, twenty-one".