49377728521 has 9 divisors (see below), whose sum is σ = 54277380199. Its totient is φ = 44886622000.

The previous prime is 49377728509. The next prime is 49377728623. The reversal of 49377728521 is 12582777394.

The square root of 49377728521 is 222211.

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

It can be written as a sum of positive squares in only one way, i.e., 4888521 + 49372840000 = 2211^2 + 222200^2 .

It is not a de Polignac number, because 49377728521 - 2²³ = 49369339913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49377728221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2434221 + ... + 2454421.

Almost surely, 2^49377728521 is an apocalyptic number.

49377728521 is the 222211-st square number.

49377728521 is the 111106-th centered octagonal number.

It is an amenable number.

49377728521 is a deficient number, since it is larger than the sum of its proper divisors (4899651678).

49377728521 is an frugal number, since it uses more digits than its factorization.

49377728521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40424 (or 20212 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 55.

The spelling of 49377728521 in words is "forty-nine billion, three hundred seventy-seven million, seven hundred twenty-eight thousand, five hundred twenty-one".