13772981 has 4 divisors (see below), whose sum is σ = 13788192. Its totient is φ = 13757772.

The previous prime is 13772977. The next prime is 13773013. The reversal of 13772981 is 18927731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13772981 - 2² = 13772977 is a prime.

It is a super-2 number, since 2×13772981² = 379390011252722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13772921) 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, 6155 + ... + 8088.

It is an arithmetic number, because the mean of its divisors is an integer number (3447048).

Almost surely, 2^13772981 is an apocalyptic number.

It is an amenable number.

13772981 is a deficient number, since it is larger than the sum of its proper divisors (15211).

13772981 is an equidigital number, since it uses as much as digits as its factorization.

13772981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15210.

The product of its digits is 21168, while the sum is 38.

The square root of 13772981 is about 3711.1967072630. The cubic root of 13772981 is about 239.7043871947.

The spelling of 13772981 in words is "thirteen million, seven hundred seventy-two thousand, nine hundred eighty-one".