521354109 has 4 divisors (see below), whose sum is σ = 695138816. Its totient is φ = 347569404.

The previous prime is 521354069. The next prime is 521354117. The reversal of 521354109 is 901453125.

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 521354109 - 2⁷ = 521353981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521354159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86892349 + ... + 86892354.

It is an arithmetic number, because the mean of its divisors is an integer number (173784704).

Almost surely, 2^521354109 is an apocalyptic number.

It is an amenable number.

521354109 is a deficient number, since it is larger than the sum of its proper divisors (173784707).

521354109 is a wasteful number, since it uses less digits than its factorization.

521354109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173784706.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 521354109 is about 22833.1800019183. The cubic root of 521354109 is about 804.8425596452.

The spelling of 521354109 in words is "five hundred twenty-one million, three hundred fifty-four thousand, one hundred nine".