521861367 has 4 divisors (see below), whose sum is σ = 695815160. Its totient is φ = 347907576.

The previous prime is 521861341. The next prime is 521861369. The reversal of 521861367 is 763168125.

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

It is not a de Polignac number, because 521861367 - 2¹⁶ = 521795831 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 (521861369) 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, 86976892 + ... + 86976897.

It is an arithmetic number, because the mean of its divisors is an integer number (173953790).

Almost surely, 2^521861367 is an apocalyptic number.

521861367 is a deficient number, since it is larger than the sum of its proper divisors (173953793).

521861367 is a wasteful number, since it uses less digits than its factorization.

521861367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173953792.

The product of its digits is 60480, while the sum is 39.

The square root of 521861367 is about 22844.2852153443. The cubic root of 521861367 is about 805.1035022454.

The spelling of 521861367 in words is "five hundred twenty-one million, eight hundred sixty-one thousand, three hundred sixty-seven".