16001231 has 2 divisors, whose sum is σ = 16001232. Its totient is φ = 16001230.

The previous prime is 16001207. The next prime is 16001269. The reversal of 16001231 is 13210061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16001231 - 2¹⁰ = 16000207 is a prime.

It is a super-2 number, since 2×16001231² = 512078787030722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16001201) 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 as a sum of consecutive naturals, namely, 8000615 + 8000616.

It is an arithmetic number, because the mean of its divisors is an integer number (8000616).

Almost surely, 2^16001231 is an apocalyptic number.

16001231 is a deficient number, since it is larger than the sum of its proper divisors (1).

16001231 is an equidigital number, since it uses as much as digits as its factorization.

16001231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 16001231 is about 4000.1538720404. The cubic root of 16001231 is about 251.9906721583.

Adding to 16001231 its reverse (13210061), we get a palindrome (29211292).

The spelling of 16001231 in words is "sixteen million, one thousand, two hundred thirty-one".