10549138681 has 9 divisors (see below), whose sum is σ = 10616219973. Its totient is φ = 10482480540.

The previous prime is 10549138661. The next prime is 10549138693. The reversal of 10549138681 is 18683194501.

The square root of 10549138681 is 102709.

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

It is not a de Polignac number, because 10549138681 - 2⁷ = 10549138553 is a prime.

It is a super-2 number, since 2×10549138681² (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 (10549138601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27833950 + ... + 27834328.

It is an arithmetic number, because the mean of its divisors is an integer number (1179579997).

Almost surely, 2^10549138681 is an apocalyptic number.

10549138681 is the 102709-th square number.

10549138681 is the 51355-th centered octagonal number.

It is an amenable number.

10549138681 is a deficient number, since it is larger than the sum of its proper divisors (67081292).

10549138681 is an frugal number, since it uses more digits than its factorization.

10549138681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 10549138681 in words is "ten billion, five hundred forty-nine million, one hundred thirty-eight thousand, six hundred eighty-one".