347971391881 has 27 divisors (see below), whose sum is σ = 363442883349. Its totient is φ = 333151560288.

The previous prime is 347971391777. The next prime is 347971391903. The reversal of 347971391881 is 188193179743.

The square root of 347971391881 is 589891.

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

It can be written as a sum of positive squares in 4 ways, for example, as 126225225 + 347845166656 = 11235^2 + 589784^2 .

It is not a de Polignac number, because 347971391881 - 2¹³ = 347971383689 is a prime.

It is a super-2 number, since 2×347971391881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (347971398881) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2335378395 + ... + 2335378543.

Almost surely, 2^347971391881 is an apocalyptic number.

347971391881 is the 589891-st square number.

347971391881 is the 294946-th centered octagonal number.

It is an amenable number.

347971391881 is a deficient number, since it is larger than the sum of its proper divisors (15471491468).

347971391881 is an frugal number, since it uses more digits than its factorization.

347971391881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586 (or 293 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 61.

The spelling of 347971391881 in words is "three hundred forty-seven billion, nine hundred seventy-one million, three hundred ninety-one thousand, eight hundred eighty-one".