521407145 has 16 divisors (see below), whose sum is σ = 734400768. Its totient is φ = 347872320.

The previous prime is 521407141. The next prime is 521407157. The reversal of 521407145 is 541704125.

It is not a de Polignac number, because 521407145 - 2² = 521407141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521407141) 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 15 ways as a sum of consecutive naturals, for example, 200021 + ... + 202610.

It is an arithmetic number, because the mean of its divisors is an integer number (45900048).

Almost surely, 2^521407145 is an apocalyptic number.

It is an amenable number.

521407145 is a deficient number, since it is larger than the sum of its proper divisors (212993623).

521407145 is a wasteful number, since it uses less digits than its factorization.

521407145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402680.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 521407145 is about 22834.3413524454. The cubic root of 521407145 is about 804.8698502345.

The spelling of 521407145 in words is "five hundred twenty-one million, four hundred seven thousand, one hundred forty-five".