49689313921 has 15 divisors (see below), whose sum is σ = 53870787221. Its totient is φ = 45832284888.

The previous prime is 49689313913. The next prime is 49689313943. The reversal of 49689313921 is 12931398694.

It is a happy number.

The square root of 49689313921 is 222911.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24636755521 + 25052558400 = 156961^2 + 158280^2 .

It is not a de Polignac number, because 49689313921 - 2³ = 49689313913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49689310921) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 37671300 + ... + 37672618.

Almost surely, 2^49689313921 is an apocalyptic number.

49689313921 is the 222911-st square number.

49689313921 is the 111456-th centered octagonal number.

It is an amenable number.

49689313921 is a deficient number, since it is larger than the sum of its proper divisors (4181473300).

49689313921 is an frugal number, since it uses more digits than its factorization.

49689313921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690 (or 1332 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 55.

The spelling of 49689313921 in words is "forty-nine billion, six hundred eighty-nine million, three hundred thirteen thousand, nine hundred twenty-one".