16504001 has 4 divisors (see below), whose sum is σ = 16658352. Its totient is φ = 16349652.

The previous prime is 16503953. The next prime is 16504049. The reversal of 16504001 is 10040561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10040561 = 59 ⋅170179.

It is an interprime number because it is at equal distance from previous prime (16503953) and next prime (16504049).

It is a cyclic number.

It is not a de Polignac number, because 16504001 - 2¹⁰ = 16502977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16506001) 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, 77015 + ... + 77228.

It is an arithmetic number, because the mean of its divisors is an integer number (4164588).

Almost surely, 2^16504001 is an apocalyptic number.

It is an amenable number.

16504001 is a deficient number, since it is larger than the sum of its proper divisors (154351).

16504001 is a wasteful number, since it uses less digits than its factorization.

16504001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154350.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 16504001 is about 4062.5116615217. The cubic root of 16504001 is about 254.6027442595.

Adding to 16504001 its reverse (10040561), we get a palindrome (26544562).

The spelling of 16504001 in words is "sixteen million, five hundred four thousand, one".