521440101 has 48 divisors (see below), whose sum is σ = 929393920. Its totient is φ = 274337280.

The previous prime is 521440081. The next prime is 521440103. The reversal of 521440101 is 101044125.

521440101 is a `hidden beast` number, since 521 + 4 + 40 + 101 = 666.

It is not a de Polignac number, because 521440101 - 2⁵ = 521440069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521440103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 516285 + ... + 517293.

Almost surely, 2^521440101 is an apocalyptic number.

It is an amenable number.

521440101 is a deficient number, since it is larger than the sum of its proper divisors (407953819).

521440101 is a wasteful number, since it uses less digits than its factorization.

521440101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666 (or 1663 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 521440101 is about 22835.0629734188. The cubic root of 521440101 is about 804.8868073809.

Adding to 521440101 its reverse (101044125), we get a palindrome (622484226).

The spelling of 521440101 in words is "five hundred twenty-one million, four hundred forty thousand, one hundred one".