49278228169 has 3 divisors (see below), whose sum is σ = 49278450157. Its totient is φ = 49278006182.

The previous prime is 49278228161. The next prime is 49278228199. The reversal of 49278228169 is 96182287294.

It is a happy number.

The square root of 49278228169 is 221987.

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 49278228169 - 2³ = 49278228161 is a prime.

It is a super-2 number, since 2×49278228169² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49278228161) 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, 110994 + ... + 332980.

Almost surely, 2^49278228169 is an apocalyptic number.

49278228169 is the 221987-th square number.

49278228169 is the 110994-th centered octagonal number.

It is an amenable number.

49278228169 is a deficient number, since it is larger than the sum of its proper divisors (221988).

49278228169 is an frugal number, since it uses more digits than its factorization.

49278228169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443974 (or 221987 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

It can be divided in two parts, 4927822816 and 9, that multiplied together give a palindrome (44350405344).

The spelling of 49278228169 in words is "forty-nine billion, two hundred seventy-eight million, two hundred twenty-eight thousand, one hundred sixty-nine".