521473165 has 8 divisors (see below), whose sum is σ = 645954048. Its totient is φ = 403721040.

The previous prime is 521473129. The next prime is 521473171. The reversal of 521473165 is 561374125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521473165 - 2¹⁵ = 521440397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521473165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1682017 + ... + 1682326.

It is an arithmetic number, because the mean of its divisors is an integer number (80744256).

Almost surely, 2^521473165 is an apocalyptic number.

It is an amenable number.

521473165 is a deficient number, since it is larger than the sum of its proper divisors (124480883).

521473165 is a wasteful number, since it uses less digits than its factorization.

521473165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364379.

The product of its digits is 25200, while the sum is 34.

The square root of 521473165 is about 22835.7869362980. The cubic root of 521473165 is about 804.9038193796.

The spelling of 521473165 in words is "five hundred twenty-one million, four hundred seventy-three thousand, one hundred sixty-five".