521700049 has 8 divisors (see below), whose sum is σ = 562443560. Its totient is φ = 481044096.

The previous prime is 521700013. The next prime is 521700061. The reversal of 521700049 is 940007125.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4592449 + 517107600 = 2143^2 + 22740^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521700049 - 2⁷ = 521699921 is a prime.

It is a super-2 number, since 2×521700049² = 544341882253204802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521700079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9234 + ... + 33595.

It is an arithmetic number, because the mean of its divisors is an integer number (70305445).

Almost surely, 2^521700049 is an apocalyptic number.

It is an amenable number.

521700049 is a deficient number, since it is larger than the sum of its proper divisors (40743511).

521700049 is a wasteful number, since it uses less digits than its factorization.

521700049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43779.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 521700049 is about 22840.7541250284. The cubic root of 521700049 is about 805.0205357209.

The spelling of 521700049 in words is "five hundred twenty-one million, seven hundred thousand, forty-nine".