521071051 has 4 divisors (see below), whose sum is σ = 521245000. Its totient is φ = 520897104.

The previous prime is 521071013. The next prime is 521071079. The reversal of 521071051 is 150170125.

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 521071051 - 2²⁵ = 487516619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521071081) 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, 82401 + ... + 88498.

It is an arithmetic number, because the mean of its divisors is an integer number (130311250).

Almost surely, 2^521071051 is an apocalyptic number.

521071051 is a deficient number, since it is larger than the sum of its proper divisors (173949).

521071051 is a wasteful number, since it uses less digits than its factorization.

521071051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173948.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 521071051 is about 22826.9807683802. The cubic root of 521071051 is about 804.6968759577.

The spelling of 521071051 in words is "five hundred twenty-one million, seventy-one thousand, fifty-one".