49571686609 has 3 divisors (see below), whose sum is σ = 49571909257. Its totient is φ = 49571463962.

The previous prime is 49571686597. The next prime is 49571686643. The reversal of 49571686609 is 90668617594.

The square root of 49571686609 is 222647.

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 49571686609 - 2¹³ = 49571678417 is a prime.

It is a super-2 number, since 2×49571686609² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49571686669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 111324 + ... + 333970.

Almost surely, 2^49571686609 is an apocalyptic number.

49571686609 is the 222647-th square number.

49571686609 is the 111324-th centered octagonal number.

It is an amenable number.

49571686609 is a deficient number, since it is larger than the sum of its proper divisors (222648).

49571686609 is an frugal number, since it uses more digits than its factorization.

49571686609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445294 (or 222647 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 49571686609 in words is "forty-nine billion, five hundred seventy-one million, six hundred eighty-six thousand, six hundred nine".