347777081 has 2 divisors, whose sum is σ = 347777082. Its totient is φ = 347777080.

The previous prime is 347777063. The next prime is 347777113. The reversal of 347777081 is 180777743.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318444025 + 29333056 = 17845^2 + 5416^2 .

It is an emirp because it is prime and its reverse (180777743) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-347777081 is a prime.

It is a super-2 number, since 2×347777081² = 241897796137761122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (347777021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173888540 + 173888541.

It is an arithmetic number, because the mean of its divisors is an integer number (173888541).

Almost surely, 2^347777081 is an apocalyptic number.

It is an amenable number.

347777081 is a deficient number, since it is larger than the sum of its proper divisors (1).

347777081 is an equidigital number, since it uses as much as digits as its factorization.

347777081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230496, while the sum is 44.

The square root of 347777081 is about 18648.7822926860. The cubic root of 347777081 is about 703.2347439856.

The spelling of 347777081 in words is "three hundred forty-seven million, seven hundred seventy-seven thousand, eighty-one".