13511970081 has 9 divisors (see below), whose sum is σ = 19517793841. Its totient is φ = 9007747572.

The previous prime is 13511970071. The next prime is 13511970119. The reversal of 13511970081 is 18007911531.

The square root of 13511970081 is 116241.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 13511970081 - 2⁷ = 13511969953 is a prime.

It is a super-2 number, since 2×13511970081² (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 (13511970071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 329350 + ... + 368096.

Almost surely, 2^13511970081 is an apocalyptic number.

13511970081 is the 116241-st square number.

13511970081 is the 58121-st centered octagonal number.

It is an amenable number.

13511970081 is a deficient number, since it is larger than the sum of its proper divisors (6005823760).

13511970081 is an frugal number, since it uses more digits than its factorization.

13511970081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77500 (or 38750 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 36.

Multiplying 13511970081 by its sum of digits (36), we get a square (486430922916 = 697446²).

The spelling of 13511970081 in words is "thirteen billion, five hundred eleven million, nine hundred seventy thousand, eighty-one".