13628891 has 2 divisors, whose sum is σ = 13628892. Its totient is φ = 13628890.

The previous prime is 13628887. The next prime is 13628899. The reversal of 13628891 is 19882631.

It is a weak prime.

It is an emirp because it is prime and its reverse (19882631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13628891 - 2² = 13628887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13628899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6814445 + 6814446.

It is an arithmetic number, because the mean of its divisors is an integer number (6814446).

Almost surely, 2^13628891 is an apocalyptic number.

13628891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13628891 is an equidigital number, since it uses as much as digits as its factorization.

13628891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 13628891 is about 3691.7327909804. The cubic root of 13628891 is about 238.8655429702.

The spelling of 13628891 in words is "thirteen million, six hundred twenty-eight thousand, eight hundred ninety-one".