16423681 has 2 divisors, whose sum is σ = 16423682. Its totient is φ = 16423680.

The previous prime is 16423663. The next prime is 16423699. The reversal of 16423681 is 18632461.

It is a happy number.

16423681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (16423663) and next prime (16423699).

It can be written as a sum of positive squares in only one way, i.e., 8673025 + 7750656 = 2945^2 + 2784^2 .

It is a cyclic number.

It is not a de Polignac number, because 16423681 - 2⁷ = 16423553 is a prime.

It is a super-2 number, since 2×16423681² = 539474595179522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16423621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211840 + 8211841.

It is an arithmetic number, because the mean of its divisors is an integer number (8211841).

Almost surely, 2^16423681 is an apocalyptic number.

It is an amenable number.

16423681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16423681 is an equidigital number, since it uses as much as digits as its factorization.

16423681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 16423681 is about 4052.6140946308. The cubic root of 16423681 is about 254.1890474723.

The spelling of 16423681 in words is "sixteen million, four hundred twenty-three thousand, six hundred eighty-one".