13721143 has 2 divisors, whose sum is σ = 13721144. Its totient is φ = 13721142.

The previous prime is 13721129. The next prime is 13721161. The reversal of 13721143 is 34112731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13721143 - 2⁵ = 13721111 is a prime.

It is a super-3 number, since 3×13721143³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13721243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6860571 + 6860572.

It is an arithmetic number, because the mean of its divisors is an integer number (6860572).

Almost surely, 2^13721143 is an apocalyptic number.

13721143 is a deficient number, since it is larger than the sum of its proper divisors (1).

13721143 is an equidigital number, since it uses as much as digits as its factorization.

13721143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 22.

The square root of 13721143 is about 3704.2061227745. The cubic root of 13721143 is about 239.4032803178.

Adding to 13721143 its reverse (34112731), we get a palindrome (47833874).

The spelling of 13721143 in words is "thirteen million, seven hundred twenty-one thousand, one hundred forty-three".