13509849537 has 6 divisors (see below), whose sum is σ = 19514227122. Its totient is φ = 9006566352.

The previous prime is 13509849533. The next prime is 13509849557. The reversal of 13509849537 is 73594890531.

13509849537 is a `hidden beast` number, since 1 + 3 + 509 + 84 + 9 + 53 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13151731761 + 358117776 = 114681^2 + 18924^2 .

It is not a de Polignac number, because 13509849537 - 2² = 13509849533 is a prime.

It is a super-2 number, since 2×13509849537² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13509849533) 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, 750547188 + ... + 750547205.

It is an arithmetic number, because the mean of its divisors is an integer number (3252371187).

Almost surely, 2^13509849537 is an apocalyptic number.

It is an amenable number.

13509849537 is a deficient number, since it is larger than the sum of its proper divisors (6004377585).

13509849537 is a wasteful number, since it uses less digits than its factorization.

13509849537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501094399 (or 1501094396 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 13509849537 in words is "thirteen billion, five hundred nine million, eight hundred forty-nine thousand, five hundred thirty-seven".