16219801 has 8 divisors (see below), whose sum is σ = 17940104. Its totient is φ = 14567040.

The previous prime is 16219783. The next prime is 16219811. The reversal of 16219801 is 10891261.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 179776 + 16040025 = 424^2 + 4005^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16219801 - 2⁵ = 16219769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16219801.

It is not an unprimeable number, because it can be changed into a prime (16219811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16380 + ... + 17341.

It is an arithmetic number, because the mean of its divisors is an integer number (2242513).

Almost surely, 2^16219801 is an apocalyptic number.

It is an amenable number.

16219801 is a deficient number, since it is larger than the sum of its proper divisors (1720303).

16219801 is a wasteful number, since it uses less digits than its factorization.

16219801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33771.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 16219801 is about 4027.3814073167. The cubic root of 16219801 is about 253.1328490377.

It can be divided in two parts, 16219 and 801, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 16219801 in words is "sixteen million, two hundred nineteen thousand, eight hundred one".