13722231 has 4 divisors (see below), whose sum is σ = 18296312. Its totient is φ = 9148152.

The previous prime is 13722229. The next prime is 13722239. The reversal of 13722231 is 13222731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13222731 = 3 ⋅4407577.

It is not a de Polignac number, because 13722231 - 2¹ = 13722229 is a prime.

It is a super-2 number, since 2×13722231² = 376599247234722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13722198 and 13722207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13722239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2287036 + ... + 2287041.

It is an arithmetic number, because the mean of its divisors is an integer number (4574078).

Almost surely, 2^13722231 is an apocalyptic number.

13722231 is a deficient number, since it is larger than the sum of its proper divisors (4574081).

13722231 is an equidigital number, since it uses as much as digits as its factorization.

13722231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574080.

The product of its digits is 504, while the sum is 21.

The square root of 13722231 is about 3704.3529799413. The cubic root of 13722231 is about 239.4096078734.

Adding to 13722231 its reverse (13222731), we get a palindrome (26944962).

Subtracting from 13722231 its reverse (13222731), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 13722231 in words is "thirteen million, seven hundred twenty-two thousand, two hundred thirty-one".