4129781871 has 4 divisors (see below), whose sum is σ = 5506375832. Its totient is φ = 2753187912.

The previous prime is 4129781869. The next prime is 4129781891. The reversal of 4129781871 is 1781879214.

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

It is not a de Polignac number, because 4129781871 - 2¹ = 4129781869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4129781871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4129781891) 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, 688296976 + ... + 688296981.

It is an arithmetic number, because the mean of its divisors is an integer number (1376593958).

Almost surely, 2^4129781871 is an apocalyptic number.

4129781871 is a deficient number, since it is larger than the sum of its proper divisors (1376593961).

4129781871 is a wasteful number, since it uses less digits than its factorization.

4129781871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376593960.

The product of its digits is 225792, while the sum is 48.

The square root of 4129781871 is about 64263.3789261038. The cubic root of 4129781871 is about 1604.3866434782.

The spelling of 4129781871 in words is "four billion, one hundred twenty-nine million, seven hundred eighty-one thousand, eight hundred seventy-one".