521424001 has 4 divisors (see below), whose sum is σ = 595913152. Its totient is φ = 446934852.

The previous prime is 521423971. The next prime is 521424041. The reversal of 521424001 is 100424125.

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.

It is not a de Polignac number, because 521424001 - 2⁷ = 521423873 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 521424001.

It is not an unprimeable number, because it can be changed into a prime (521424041) 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, 37244565 + ... + 37244578.

It is an arithmetic number, because the mean of its divisors is an integer number (148978288).

Almost surely, 2^521424001 is an apocalyptic number.

It is an amenable number.

521424001 is a deficient number, since it is larger than the sum of its proper divisors (74489151).

521424001 is an equidigital number, since it uses as much as digits as its factorization.

521424001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74489150.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 521424001 is about 22834.7104426572. The cubic root of 521424001 is about 804.8785233927.

Adding to 521424001 its reverse (100424125), we get a palindrome (621848126).

The spelling of 521424001 in words is "five hundred twenty-one million, four hundred twenty-four thousand, one".