49531619921 has 16 divisors (see below), whose sum is σ = 58560488448. Its totient is φ = 40996929600.

The previous prime is 49531619911. The next prime is 49531619981. The reversal of 49531619921 is 12991613594.

It is a de Polignac number, because none of the positive numbers 2^k-49531619921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49531619921.

It is not an unprimeable number, because it can be changed into a prime (49531619911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147530 + ... + 347603.

It is an arithmetic number, because the mean of its divisors is an integer number (3660030528).

Almost surely, 2^49531619921 is an apocalyptic number.

It is an amenable number.

49531619921 is a deficient number, since it is larger than the sum of its proper divisors (9028868527).

49531619921 is a wasteful number, since it uses less digits than its factorization.

49531619921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495632.

The product of its digits is 524880, while the sum is 50.

The spelling of 49531619921 in words is "forty-nine billion, five hundred thirty-one million, six hundred nineteen thousand, nine hundred twenty-one".