16423861 has 2 divisors, whose sum is σ = 16423862. Its totient is φ = 16423860.

The previous prime is 16423859. The next prime is 16423871. The reversal of 16423861 is 16832461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13468900 + 2954961 = 3670^2 + 1719^2 .

It is a cyclic number.

It is not a de Polignac number, because 16423861 - 2¹ = 16423859 is a prime.

Together with 16423859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16423801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211930 + 8211931.

It is an arithmetic number, because the mean of its divisors is an integer number (8211931).

Almost surely, 2^16423861 is an apocalyptic number.

It is an amenable number.

16423861 is a deficient number, since it is larger than the sum of its proper divisors (1).

16423861 is an equidigital number, since it uses as much as digits as its factorization.

16423861 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 16423861 is about 4052.6363024579. The cubic root of 16423861 is about 254.1899760879.

It can be divided in two parts, 164 and 23861, that added together give a square (24025 = 155²).

The spelling of 16423861 in words is "sixteen million, four hundred twenty-three thousand, eight hundred sixty-one".