521040531 has 16 divisors (see below), whose sum is σ = 802459008. Its totient is φ = 297206400.

The previous prime is 521040523. The next prime is 521040557. The reversal of 521040531 is 135040125.

It is not a de Polignac number, because 521040531 - 2³ = 521040523 is a prime.

It is a super-2 number, since 2×521040531² = 542966469889523922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521040498 and 521040507.

It is not an unprimeable number, because it can be changed into a prime (521040581) 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, 463825 + ... + 464946.

It is an arithmetic number, because the mean of its divisors is an integer number (50153688).

Almost surely, 2^521040531 is an apocalyptic number.

521040531 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

521040531 is a deficient number, since it is larger than the sum of its proper divisors (281418477).

521040531 is a wasteful number, since it uses less digits than its factorization.

521040531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928802.

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

The square root of 521040531 is about 22826.3122514347. The cubic root of 521040531 is about 804.6811648386.

Adding to 521040531 its reverse (135040125), we get a palindrome (656080656).

The spelling of 521040531 in words is "five hundred twenty-one million, forty thousand, five hundred thirty-one".