16401001 has 8 divisors (see below), whose sum is σ = 17156160. Its totient is φ = 15649392.

The previous prime is 16400987. The next prime is 16401013. The reversal of 16401001 is 10010461.

16401001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16401001 - 2¹⁹ = 15876713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16401031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14235 + ... + 15343.

It is an arithmetic number, because the mean of its divisors is an integer number (2144520).

Almost surely, 2^16401001 is an apocalyptic number.

It is an amenable number.

16401001 is a deficient number, since it is larger than the sum of its proper divisors (755159).

16401001 is a wasteful number, since it uses less digits than its factorization.

16401001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 16401001 is about 4049.8149340433. The cubic root of 16401001 is about 254.0719875730.

Adding to 16401001 its reverse (10010461), we get a palindrome (26411462).

The spelling of 16401001 in words is "sixteen million, four hundred one thousand, one".