13721833 has 2 divisors, whose sum is σ = 13721834. Its totient is φ = 13721832.

The previous prime is 13721789. The next prime is 13721837. The reversal of 13721833 is 33812731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12581209 + 1140624 = 3547^2 + 1068^2 .

It is an emirp because it is prime and its reverse (33812731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13721833 - 2¹³ = 13713641 is a prime.

It is not a weakly prime, because it can be changed into another prime (13721837) 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 as a sum of consecutive naturals, namely, 6860916 + 6860917.

It is an arithmetic number, because the mean of its divisors is an integer number (6860917).

Almost surely, 2^13721833 is an apocalyptic number.

It is an amenable number.

13721833 is a deficient number, since it is larger than the sum of its proper divisors (1).

13721833 is an equidigital number, since it uses as much as digits as its factorization.

13721833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 13721833 is about 3704.2992589692. The cubic root of 13721833 is about 239.4072932366.

The spelling of 13721833 in words is "thirteen million, seven hundred twenty-one thousand, eight hundred thirty-three".