521741474225161 has 4 divisors (see below), whose sum is σ = 539732559543300. Its totient is φ = 503750388907024.

The previous prime is 521741474225149. The next prime is 521741474225203. The reversal of 521741474225161 is 161522474147125.

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 308608483369536 + 213132990855625 = 17567256^2 + 14599075^2 .

It is a cyclic number.

It is not a de Polignac number, because 521741474225161 - 2¹⁷ = 521741474094089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521741474225099 and 521741474225108.

It is not an unprimeable number, because it can be changed into a prime (521741474225131) 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, 8995542659026 + ... + 8995542659083.

It is an arithmetic number, because the mean of its divisors is an integer number (134933139885825).

Almost surely, 2^{521741474225161} is an apocalyptic number.

It is an amenable number.

521741474225161 is a deficient number, since it is larger than the sum of its proper divisors (17991085318139).

521741474225161 is a wasteful number, since it uses less digits than its factorization.

521741474225161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17991085318138.

The product of its digits is 3763200, while the sum is 52.

The spelling of 521741474225161 in words is "five hundred twenty-one trillion, seven hundred forty-one billion, four hundred seventy-four million, two hundred twenty-five thousand, one hundred sixty-one".