49800831921 has 27 divisors (see below), whose sum is σ = 73005082059. Its totient is φ = 32713617312.

The previous prime is 49800831911. The next prime is 49800831931. The reversal of 49800831921 is 12913800894.

The square root of 49800831921 is 223161.

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

49800831921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (49800831911) and next prime (49800831931).

It can be written as a sum of positive squares in only one way, i.e., 28269378225 + 21531453696 = 168135^2 + 146736^2 .

It is not a de Polignac number, because 49800831921 - 2³⁵ = 15441093553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (49800831911) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 48871750 + ... + 48872768.

Almost surely, 2^49800831921 is an apocalyptic number.

49800831921 is the 223161-st square number.

49800831921 is the 111581-st centered octagonal number.

It is an amenable number.

49800831921 is a deficient number, since it is larger than the sum of its proper divisors (23204250138).

49800831921 is an frugal number, since it uses more digits than its factorization.

49800831921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

It can be divided in two parts, 49800 and 831921, that added together give a square (881721 = 939²).

The spelling of 49800831921 in words is "forty-nine billion, eight hundred million, eight hundred thirty-one thousand, nine hundred twenty-one".