13891643 has 2 divisors, whose sum is σ = 13891644. Its totient is φ = 13891642.

The previous prime is 13891637. The next prime is 13891651. The reversal of 13891643 is 34619831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13891643 - 2¹⁰ = 13890619 is a prime.

It is a super-3 number, since 3×13891643³ (a number of 22 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13893643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945821 + 6945822.

It is an arithmetic number, because the mean of its divisors is an integer number (6945822).

Almost surely, 2^13891643 is an apocalyptic number.

13891643 is a deficient number, since it is larger than the sum of its proper divisors (1).

13891643 is an equidigital number, since it uses as much as digits as its factorization.

13891643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 13891643 is about 3727.1494469635. The cubic root of 13891643 is about 240.3908157967.

The spelling of 13891643 in words is "thirteen million, eight hundred ninety-one thousand, six hundred forty-three".