47809933981 has 4 divisors (see below), whose sum is σ = 47810730492. Its totient is φ = 47809137472.

The previous prime is 47809933973. The next prime is 47809933999. The reversal of 47809933981 is 18933990874.

47809933981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 20594833081 + 27215100900 = 143509^2 + 164970^2 .

It is a cyclic number.

It is not a de Polignac number, because 47809933981 - 2³ = 47809933973 is a prime.

It is a super-2 number, since 2×47809933981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47809939981) 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, 300166 + ... + 430951.

It is an arithmetic number, because the mean of its divisors is an integer number (11952682623).

Almost surely, 2^47809933981 is an apocalyptic number.

It is an amenable number.

47809933981 is a deficient number, since it is larger than the sum of its proper divisors (796511).

47809933981 is an equidigital number, since it uses as much as digits as its factorization.

47809933981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796510.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 47809933981 in words is "forty-seven billion, eight hundred nine million, nine hundred thirty-three thousand, nine hundred eighty-one".