346991081 has 2 divisors, whose sum is σ = 346991082. Its totient is φ = 346991080.

The previous prime is 346991059. The next prime is 346991093. The reversal of 346991081 is 180199643.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316840000 + 30151081 = 17800^2 + 5491^2 .

It is a cyclic number.

It is not a de Polignac number, because 346991081 - 2¹⁰ = 346990057 is a prime.

It is a super-2 number, since 2×346991081² = 240805620587097122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (346991681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173495540 + 173495541.

It is an arithmetic number, because the mean of its divisors is an integer number (173495541).

Almost surely, 2^346991081 is an apocalyptic number.

It is an amenable number.

346991081 is a deficient number, since it is larger than the sum of its proper divisors (1).

346991081 is an equidigital number, since it uses as much as digits as its factorization.

346991081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 346991081 is about 18627.6966101555. The cubic root of 346991081 is about 702.7045581524.

The spelling of 346991081 in words is "three hundred forty-six million, nine hundred ninety-one thousand, eighty-one".