1681536001 has 4 divisors (see below), whose sum is σ = 1681626672. Its totient is φ = 1681445332.

The previous prime is 1681535903. The next prime is 1681536023. The reversal of 1681536001 is 1006351861.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1006351861 = 7477 ⋅134593.

It is a cyclic number.

It is not a de Polignac number, because 1681536001 - 2²⁷ = 1547318273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681536091) 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 3 ways as a sum of consecutive naturals, for example, 6331 + ... + 58336.

It is an arithmetic number, because the mean of its divisors is an integer number (420406668).

Almost surely, 2^1681536001 is an apocalyptic number.

It is an amenable number.

1681536001 is a deficient number, since it is larger than the sum of its proper divisors (90671).

1681536001 is an equidigital number, since it uses as much as digits as its factorization.

1681536001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90670.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1681536001 is about 41006.5360765817. The cubic root of 1681536001 is about 1189.1465766255.

Adding to 1681536001 its reverse (1006351861), we get a palindrome (2687887862).

The spelling of 1681536001 in words is "one billion, six hundred eighty-one million, five hundred thirty-six thousand, one".