10531513521 has 6 divisors (see below), whose sum is σ = 15212186210. Its totient is φ = 7021009008.

The previous prime is 10531513519. The next prime is 10531513529. The reversal of 10531513521 is 12531513501.

10531513521 is a `hidden beast` number, since 105 + 31 + 5 + 1 + 3 + 521 = 666.

10531513521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5275988496 + 5255525025 = 72636^2 + 72495^2 .

It is not a de Polignac number, because 10531513521 - 2¹ = 10531513519 is a prime.

It is a super-2 number, since 2×10531513521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10531513529) 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 5 ways as a sum of consecutive naturals, for example, 585084076 + ... + 585084093.

Almost surely, 2^10531513521 is an apocalyptic number.

It is an amenable number.

10531513521 is a deficient number, since it is larger than the sum of its proper divisors (4680672689).

10531513521 is a wasteful number, since it uses less digits than its factorization.

10531513521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170168175 (or 1170168172 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The spelling of 10531513521 in words is "ten billion, five hundred thirty-one million, five hundred thirteen thousand, five hundred twenty-one".