49719487489921 has 4 divisors (see below), whose sum is σ = 49742840938500. Its totient is φ = 49696134041344.

The previous prime is 49719487489897. The next prime is 49719487489937. The reversal of 49719487489921 is 12998478491794.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32264263066896 + 17455224423025 = 5680164^2 + 4177945^2 .

It is a cyclic number.

It is not a de Polignac number, because 49719487489921 - 2¹⁹ = 49719486965633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49719487487921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11676721096 + ... + 11676725353.

It is an arithmetic number, because the mean of its divisors is an integer number (12435710234625).

Almost surely, 2^{49719487489921} is an apocalyptic number.

It is an amenable number.

49719487489921 is a deficient number, since it is larger than the sum of its proper divisors (23353448579).

49719487489921 is a wasteful number, since it uses less digits than its factorization.

49719487489921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23353448578.

The product of its digits is 2633637888, while the sum is 82.

The spelling of 49719487489921 in words is "forty-nine trillion, seven hundred nineteen billion, four hundred eighty-seven million, four hundred eighty-nine thousand, nine hundred twenty-one".