521725111 has 4 divisors (see below), whose sum is σ = 529073424. Its totient is φ = 514376800.

The previous prime is 521725103. The next prime is 521725117. The reversal of 521725111 is 111527125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521725111 - 2³ = 521725103 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 (521725117) 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 3 ways as a sum of consecutive naturals, for example, 3674050 + ... + 3674191.

It is an arithmetic number, because the mean of its divisors is an integer number (132268356).

Almost surely, 2^521725111 is an apocalyptic number.

521725111 is a deficient number, since it is larger than the sum of its proper divisors (7348313).

521725111 is an equidigital number, since it uses as much as digits as its factorization.

521725111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7348312.

The product of its digits is 700, while the sum is 25.

The square root of 521725111 is about 22841.3027430574. The cubic root of 521725111 is about 805.0334263347.

The spelling of 521725111 in words is "five hundred twenty-one million, seven hundred twenty-five thousand, one hundred eleven".