16209901 has 4 divisors (see below), whose sum is σ = 16277404. Its totient is φ = 16142400.

The previous prime is 16209889. The next prime is 16209911. The reversal of 16209901 is 10990261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12068676 + 4141225 = 3474^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 16209901 - 2¹³ = 16201709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16209901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16209911) 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, 33390 + ... + 33871.

It is an arithmetic number, because the mean of its divisors is an integer number (4069351).

Almost surely, 2^16209901 is an apocalyptic number.

16209901 is the 2325-th hex number.

It is an amenable number.

16209901 is a deficient number, since it is larger than the sum of its proper divisors (67503).

16209901 is an equidigital number, since it uses as much as digits as its factorization.

16209901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67502.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 16209901 is about 4026.1521332409. The cubic root of 16209901 is about 253.0813374061.

The spelling of 16209901 in words is "sixteen million, two hundred nine thousand, nine hundred one".