16451231 has 4 divisors (see below), whose sum is σ = 16459872. Its totient is φ = 16442592.

The previous prime is 16451221. The next prime is 16451249. The reversal of 16451231 is 13215461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13215461 = 7 ⋅1887923.

It is a cyclic number.

It is not a de Polignac number, because 16451231 - 2⁶ = 16451167 is a prime.

It is a super-2 number, since 2×16451231² = 541286002830722, 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 = 16451197 and 16451206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16451221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71 + ... + 5736.

It is an arithmetic number, because the mean of its divisors is an integer number (4114968).

Almost surely, 2^16451231 is an apocalyptic number.

16451231 is a deficient number, since it is larger than the sum of its proper divisors (8641).

16451231 is an equidigital number, since it uses as much as digits as its factorization.

16451231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8640.

The product of its digits is 720, while the sum is 23.

The square root of 16451231 is about 4056.0117110285. The cubic root of 16451231 is about 254.3310983766.

Adding to 16451231 its reverse (13215461), we get a palindrome (29666692).

The spelling of 16451231 in words is "sixteen million, four hundred fifty-one thousand, two hundred thirty-one".