13772681 has 4 divisors (see below), whose sum is σ = 14832132. Its totient is φ = 12713232.

The previous prime is 13772677. The next prime is 13772683. The reversal of 13772681 is 18627731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18627731 = 2789 ⋅6679.

It can be written as a sum of positive squares in 2 ways, for example, as 697225 + 13075456 = 835^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 13772681 - 2² = 13772677 is a prime.

It is a super-2 number, since 2×13772681² = 379373483855522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13772683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529706 + ... + 529731.

It is an arithmetic number, because the mean of its divisors is an integer number (3708033).

Almost surely, 2^13772681 is an apocalyptic number.

It is an amenable number.

13772681 is a deficient number, since it is larger than the sum of its proper divisors (1059451).

13772681 is a wasteful number, since it uses less digits than its factorization.

13772681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059450.

The product of its digits is 14112, while the sum is 35.

The square root of 13772681 is about 3711.1562888135. The cubic root of 13772681 is about 239.7026467862.

The spelling of 13772681 in words is "thirteen million, seven hundred seventy-two thousand, six hundred eighty-one".