213881275729 has 9 divisors (see below), whose sum is σ = 235098233769. Its totient is φ = 194432898660.

The previous prime is 213881275717. The next prime is 213881275733. The reversal of 213881275729 is 927572188312.

The square root of 213881275729 is 462473.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 213881275729 - 2²¹ = 213879178577 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 213881275729.

It is not an unprimeable number, because it can be changed into a prime (213881275739) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5066182 + ... + 5108224.

Almost surely, 2^213881275729 is an apocalyptic number.

213881275729 is the 462473-rd square number.

213881275729 is the 231237-th centered octagonal number.

It is an amenable number.

213881275729 is a deficient number, since it is larger than the sum of its proper divisors (21216958040).

213881275729 is an frugal number, since it uses more digits than its factorization.

213881275729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84108 (or 42054 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 55.

The spelling of 213881275729 in words is "two hundred thirteen billion, eight hundred eighty-one million, two hundred seventy-five thousand, seven hundred twenty-nine".