346478681 has 2 divisors, whose sum is σ = 346478682. Its totient is φ = 346478680.

The previous prime is 346478611. The next prime is 346478729. The reversal of 346478681 is 186874643.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184960000 + 161518681 = 13600^2 + 12709^2 .

It is an emirp because it is prime and its reverse (186874643) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 346478681 - 2²⁶ = 279369817 is a prime.

It is a super-2 number, since 2×346478681² = 240094952774999522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (346478611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173239340 + 173239341.

It is an arithmetic number, because the mean of its divisors is an integer number (173239341).

Almost surely, 2^346478681 is an apocalyptic number.

It is an amenable number.

346478681 is a deficient number, since it is larger than the sum of its proper divisors (1).

346478681 is an equidigital number, since it uses as much as digits as its factorization.

346478681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 47.

The square root of 346478681 is about 18613.9378155188. The cubic root of 346478681 is about 702.3584943133.

The spelling of 346478681 in words is "three hundred forty-six million, four hundred seventy-eight thousand, six hundred eighty-one".