16401553 has 8 divisors (see below), whose sum is σ = 19559808. Its totient is φ = 13447104.

The previous prime is 16401551. The next prime is 16401563. The reversal of 16401553 is 35510461.

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 16401553 - 2¹ = 16401551 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (16401551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50776 + ... + 51097.

It is an arithmetic number, because the mean of its divisors is an integer number (2444976).

Almost surely, 2^16401553 is an apocalyptic number.

It is an amenable number.

16401553 is a deficient number, since it is larger than the sum of its proper divisors (3158255).

16401553 is a wasteful number, since it uses less digits than its factorization.

16401553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101903.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 16401553 is about 4049.8830847322. The cubic root of 16401553 is about 254.0748379308.

The spelling of 16401553 in words is "sixteen million, four hundred one thousand, five hundred fifty-three".