13921549 has 2 divisors, whose sum is σ = 13921550. Its totient is φ = 13921548.

The previous prime is 13921519. The next prime is 13921559. The reversal of 13921549 is 94512931.

13921549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13912900 + 8649 = 3730^2 + 93^2 .

It is a cyclic number.

It is not a de Polignac number, because 13921549 - 2¹³ = 13913357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13921519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6960774 + 6960775.

It is an arithmetic number, because the mean of its divisors is an integer number (6960775).

Almost surely, 2^13921549 is an apocalyptic number.

It is an amenable number.

13921549 is a deficient number, since it is larger than the sum of its proper divisors (1).

13921549 is an equidigital number, since it uses as much as digits as its factorization.

13921549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 13921549 is about 3731.1592032504. The cubic root of 13921549 is about 240.5631970135.

The spelling of 13921549 in words is "thirteen million, nine hundred twenty-one thousand, five hundred forty-nine".