215534562049 has 3 divisors (see below), whose sum is σ = 215535026307. Its totient is φ = 215534097792.

The previous prime is 215534562043. The next prime is 215534562053. The reversal of 215534562049 is 940265435512.

The square root of 215534562049 is 464257.

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., 47460801025 + 168073761024 = 217855^2 + 409968^2 .

It is not a de Polignac number, because 215534562049 - 2²³ = 215526173441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215534562043) 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, 232129 + ... + 696385.

It is an arithmetic number, because the mean of its divisors is an integer number (71845008769).

Almost surely, 2^215534562049 is an apocalyptic number.

215534562049 is the 464257-th square number.

215534562049 is the 232129-th centered octagonal number.

It is an amenable number.

215534562049 is a deficient number, since it is larger than the sum of its proper divisors (464258).

215534562049 is an frugal number, since it uses more digits than its factorization.

215534562049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928514 (or 464257 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 215534562049 in words is "two hundred fifteen billion, five hundred thirty-four million, five hundred sixty-two thousand, forty-nine".