521431001 has 32 divisors (see below), whose sum is σ = 658694400. Its totient is φ = 410151168.

The previous prime is 521430979. The next prime is 521431061. The reversal of 521431001 is 100134125.

It is not a de Polignac number, because 521431001 - 2⁶ = 521430937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521431061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1502510 + ... + 1502856.

It is an arithmetic number, because the mean of its divisors is an integer number (20584200).

Almost surely, 2^521431001 is an apocalyptic number.

It is an amenable number.

521431001 is a deficient number, since it is larger than the sum of its proper divisors (137263399).

521431001 is a wasteful number, since it uses less digits than its factorization.

521431001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 704 counting only the distinct ones).

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

The square root of 521431001 is about 22834.8637175701. The cubic root of 521431001 is about 804.8821251477.

Adding to 521431001 its reverse (100134125), we get a palindrome (621565126).

The spelling of 521431001 in words is "five hundred twenty-one million, four hundred thirty-one thousand, one".