215896834609 has 3 divisors (see below), whose sum is σ = 215897299257. Its totient is φ = 215896369962.

The previous prime is 215896834477. The next prime is 215896834613. The reversal of 215896834609 is 906438698512.

The square root of 215896834609 is 464647.

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 is not a de Polignac number, because 215896834609 - 2¹³ = 215896826417 is a prime.

It is a super-2 number, since 2×215896834609² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215896834709) 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, 232324 + ... + 696970.

It is an arithmetic number, because the mean of its divisors is an integer number (71965766419).

Almost surely, 2^215896834609 is an apocalyptic number.

215896834609 is the 464647-th square number.

215896834609 is the 232324-th centered octagonal number.

It is an amenable number.

215896834609 is a deficient number, since it is larger than the sum of its proper divisors (464648).

215896834609 is an frugal number, since it uses more digits than its factorization.

215896834609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929294 (or 464647 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 215896834609 in words is "two hundred fifteen billion, eight hundred ninety-six million, eight hundred thirty-four thousand, six hundred nine".