347582172721 has 9 divisors (see below), whose sum is σ = 404335083321. Its totient is φ = 297924039252.

The previous prime is 347582172713. The next prime is 347582172761. The reversal of 347582172721 is 127271285743.

The square root of 347582172721 is 589561.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 347582172721 - 2³ = 347582172713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (347582172761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4084816 + ... + 4169038.

It is an arithmetic number, because the mean of its divisors is an integer number (44926120369).

Almost surely, 2^347582172721 is an apocalyptic number.

347582172721 is the 589561-st square number.

347582172721 is the 294781-st centered octagonal number.

It is an amenable number.

347582172721 is a deficient number, since it is larger than the sum of its proper divisors (56752910600).

347582172721 is an frugal number, since it uses more digits than its factorization.

347582172721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168460 (or 84230 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 49.

Multiplying 347582172721 by its sum of digits (49), we get a square (17031526463329 = 4126927²).

347582172721 divided by its sum of digits (49) gives a square (7093513729 = 84223²).

The spelling of 347582172721 in words is "three hundred forty-seven billion, five hundred eighty-two million, one hundred seventy-two thousand, seven hundred twenty-one".