521040545 has 4 divisors (see below), whose sum is σ = 625248660. Its totient is φ = 416832432.

The previous prime is 521040523. The next prime is 521040557. The reversal of 521040545 is 545040125.

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

It can be written as a sum of positive squares in 2 ways, for example, as 103083409 + 417957136 = 10153^2 + 20444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521040545 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52104050 + ... + 52104059.

It is an arithmetic number, because the mean of its divisors is an integer number (156312165).

Almost surely, 2^521040545 is an apocalyptic number.

It is an amenable number.

521040545 is a deficient number, since it is larger than the sum of its proper divisors (104208115).

521040545 is a wasteful number, since it uses less digits than its factorization.

521040545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104208114.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 521040545 is about 22826.3125580984. The cubic root of 521040545 is about 804.6811720456.

The spelling of 521040545 in words is "five hundred twenty-one million, forty thousand, five hundred forty-five".