49691988889 has 9 divisors (see below), whose sum is σ = 50942919261. Its totient is φ = 48471072480.

The previous prime is 49691988887. The next prime is 49691988917. The reversal of 49691988889 is 98888919694.

The square root of 49691988889 is 222917.

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

It can be written as a sum of positive squares in 4 ways, for example, as 11396630025 + 38295358864 = 106755^2 + 195692^2 .

It is not a de Polignac number, because 49691988889 - 2¹ = 49691988887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49691988887) 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, 9136879 + ... + 9142315.

Almost surely, 2^49691988889 is an apocalyptic number.

49691988889 is the 222917-th square number.

49691988889 is the 111459-th centered octagonal number.

It is an amenable number.

49691988889 is a deficient number, since it is larger than the sum of its proper divisors (1250930372).

49691988889 is an frugal number, since it uses more digits than its factorization.

49691988889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10956 (or 5478 counting only the distinct ones).

The product of its digits is 644972544, while the sum is 79.

The spelling of 49691988889 in words is "forty-nine billion, six hundred ninety-one million, nine hundred eighty-eight thousand, eight hundred eighty-nine".