218497348969 has 3 divisors (see below), whose sum is σ = 218497816407. Its totient is φ = 218496881532.

The previous prime is 218497348939. The next prime is 218497348973. The reversal of 218497348969 is 969843794812.

The square root of 218497348969 is 467437.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 92321784025 + 126175564944 = 303845^2 + 355212^2 .

It is not a de Polignac number, because 218497348969 - 2²¹ = 218495251817 is a prime.

It is a super-2 number, since 2×218497348969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218497348898 and 218497348907.

It is not an unprimeable number, because it can be changed into a prime (218497348939) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 233719 + ... + 701155.

It is an arithmetic number, because the mean of its divisors is an integer number (72832605469).

Almost surely, 2^218497348969 is an apocalyptic number.

218497348969 is the 467437-th square number.

218497348969 is the 233719-th centered octagonal number.

It is an amenable number.

218497348969 is a deficient number, since it is larger than the sum of its proper divisors (467438).

218497348969 is an frugal number, since it uses more digits than its factorization.

218497348969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934874 (or 467437 counting only the distinct ones).

The product of its digits is 188116992, while the sum is 70.

The spelling of 218497348969 in words is "two hundred eighteen billion, four hundred ninety-seven million, three hundred forty-eight thousand, nine hundred sixty-nine".