345641729 has 2 divisors, whose sum is σ = 345641730. Its totient is φ = 345641728.

The previous prime is 345641693. The next prime is 345641761. The reversal of 345641729 is 927146543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340328704 + 5313025 = 18448^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 345641729 - 2⁸ = 345641473 is a prime.

It is a super-2 number, since 2×345641729² = 238936409652218882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (345641789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172820864 + 172820865.

It is an arithmetic number, because the mean of its divisors is an integer number (172820865).

Almost surely, 2^345641729 is an apocalyptic number.

It is an amenable number.

345641729 is a deficient number, since it is larger than the sum of its proper divisors (1).

345641729 is an equidigital number, since it uses as much as digits as its factorization.

345641729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 345641729 is about 18591.4423593222. The cubic root of 345641729 is about 701.7925005567.

The spelling of 345641729 in words is "three hundred forty-five million, six hundred forty-one thousand, seven hundred twenty-nine".