521319671 has 4 divisors (see below), whose sum is σ = 551985552. Its totient is φ = 490653792.

The previous prime is 521319611. The next prime is 521319683. The reversal of 521319671 is 176913125.

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 521319671 - 2¹⁴ = 521303287 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 (521319611) 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, 15332915 + ... + 15332948.

It is an arithmetic number, because the mean of its divisors is an integer number (137996388).

Almost surely, 2^521319671 is an apocalyptic number.

521319671 is a deficient number, since it is larger than the sum of its proper divisors (30665881).

521319671 is a wasteful number, since it uses less digits than its factorization.

521319671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30665880.

The product of its digits is 11340, while the sum is 35.

The square root of 521319671 is about 22832.4258676121. The cubic root of 521319671 is about 804.8248379867.

The spelling of 521319671 in words is "five hundred twenty-one million, three hundred nineteen thousand, six hundred seventy-one".