68309173 has 2 divisors, whose sum is σ = 68309174. Its totient is φ = 68309172.

The previous prime is 68309071. The next prime is 68309177. The reversal of 68309173 is 37190386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38464804 + 29844369 = 6202^2 + 5463^2 .

It is a cyclic number.

It is not a de Polignac number, because 68309173 - 2²¹ = 66212021 is a prime.

It is a super-2 number, since 2×68309173² = 9332286231887858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68309177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34154586 + 34154587.

It is an arithmetic number, because the mean of its divisors is an integer number (34154587).

Almost surely, 2^68309173 is an apocalyptic number.

It is an amenable number.

68309173 is a deficient number, since it is larger than the sum of its proper divisors (1).

68309173 is an equidigital number, since it uses as much as digits as its factorization.

68309173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 68309173 is about 8264.9363578917. The cubic root of 68309173 is about 408.7831718754.

The spelling of 68309173 in words is "sixty-eight million, three hundred nine thousand, one hundred seventy-three".