70646309 has 2 divisors, whose sum is σ = 70646310. Its totient is φ = 70646308.

The previous prime is 70646281. The next prime is 70646327. The reversal of 70646309 is 90364607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67601284 + 3045025 = 8222^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 70646309 - 2¹⁶ = 70580773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70649309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35323154 + 35323155.

It is an arithmetic number, because the mean of its divisors is an integer number (35323155).

Almost surely, 2^70646309 is an apocalyptic number.

It is an amenable number.

70646309 is a deficient number, since it is larger than the sum of its proper divisors (1).

70646309 is an equidigital number, since it uses as much as digits as its factorization.

70646309 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 35.

The square root of 70646309 is about 8405.1358704069. The cubic root of 70646309 is about 413.3930384761.

The spelling of 70646309 in words is "seventy million, six hundred forty-six thousand, three hundred nine".