68898209 has 2 divisors, whose sum is σ = 68898210. Its totient is φ = 68898208.

The previous prime is 68898173. The next prime is 68898211. The reversal of 68898209 is 90289886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 5536609 = 7960^2 + 2353^2 .

It is a cyclic number.

It is not a de Polignac number, because 68898209 - 2⁸ = 68897953 is a prime.

Together with 68898211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68898239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34449104 + 34449105.

It is an arithmetic number, because the mean of its divisors is an integer number (34449105).

Almost surely, 2^68898209 is an apocalyptic number.

It is an amenable number.

68898209 is a deficient number, since it is larger than the sum of its proper divisors (1).

68898209 is an equidigital number, since it uses as much as digits as its factorization.

68898209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 68898209 is about 8300.4945033414. The cubic root of 68898209 is about 409.9548016802.

The spelling of 68898209 in words is "sixty-eight million, eight hundred ninety-eight thousand, two hundred nine".