47172809749 has 4 divisors (see below), whose sum is σ = 50801487436. Its totient is φ = 43544132064.

The previous prime is 47172809681. The next prime is 47172809821. The reversal of 47172809749 is 94790827174.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94790827174 = 2 ⋅47395413587.

It can be written as a sum of positive squares in 2 ways, for example, as 29094124900 + 18078684849 = 170570^2 + 134457^2 .

It is a cyclic number.

It is not a de Polignac number, because 47172809749 - 2¹¹ = 47172807701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47172809693 and 47172809702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47172809149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814338824 + ... + 1814338849.

It is an arithmetic number, because the mean of its divisors is an integer number (12700371859).

Almost surely, 2^47172809749 is an apocalyptic number.

It is an amenable number.

47172809749 is a deficient number, since it is larger than the sum of its proper divisors (3628677687).

47172809749 is a wasteful number, since it uses less digits than its factorization.

47172809749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628677686.

The product of its (nonzero) digits is 7112448, while the sum is 58.

The spelling of 47172809749 in words is "forty-seven billion, one hundred seventy-two million, eight hundred nine thousand, seven hundred forty-nine".