521105045 has 4 divisors (see below), whose sum is σ = 625326060. Its totient is φ = 416884032.

The previous prime is 521105041. The next prime is 521105107. The reversal of 521105045 is 540501125.

It is a happy number.

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 96786244 + 424318801 = 9838^2 + 20599^2 .

It is a cyclic number.

It is not a de Polignac number, because 521105045 - 2² = 521105041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521105045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521105041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52110500 + ... + 52110509.

It is an arithmetic number, because the mean of its divisors is an integer number (156331515).

Almost surely, 2^521105045 is an apocalyptic number.

It is an amenable number.

521105045 is a deficient number, since it is larger than the sum of its proper divisors (104221015).

521105045 is a wasteful number, since it uses less digits than its factorization.

521105045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104221014.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 521105045 is about 22827.7253575559. The cubic root of 521105045 is about 804.7143747043.

The spelling of 521105045 in words is "five hundred twenty-one million, one hundred five thousand, forty-five".