345551729 has 2 divisors, whose sum is σ = 345551730. Its totient is φ = 345551728.

The previous prime is 345551693. The next prime is 345551749. The reversal of 345551729 is 927155543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 272415025 + 73136704 = 16505^2 + 8552^2 .

It is an emirp because it is prime and its reverse (927155543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345551729 - 2²⁰ = 344503153 is a prime.

It is not a weakly prime, because it can be changed into another prime (345551749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172775864 + 172775865.

It is an arithmetic number, because the mean of its divisors is an integer number (172775865).

Almost surely, 2^345551729 is an apocalyptic number.

It is an amenable number.

345551729 is a deficient number, since it is larger than the sum of its proper divisors (1).

345551729 is an equidigital number, since it uses as much as digits as its factorization.

345551729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 41.

The square root of 345551729 is about 18589.0217332704. The cubic root of 345551729 is about 701.7315831359.

The spelling of 345551729 in words is "three hundred forty-five million, five hundred fifty-one thousand, seven hundred twenty-nine".