70938209 has 2 divisors, whose sum is σ = 70938210. Its totient is φ = 70938208.

The previous prime is 70938173. The next prime is 70938211. The reversal of 70938209 is 90283907.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68425984 + 2512225 = 8272^2 + 1585^2 .

It is a cyclic number.

It is not a de Polignac number, because 70938209 - 2²⁴ = 54160993 is a prime.

It is a super-2 number, since 2×70938209² = 10064458992255362, which contains 22 as substring.

Together with 70938211, 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 (70938299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35469104 + 35469105.

It is an arithmetic number, because the mean of its divisors is an integer number (35469105).

Almost surely, 2^70938209 is an apocalyptic number.

It is an amenable number.

70938209 is a deficient number, since it is larger than the sum of its proper divisors (1).

70938209 is an equidigital number, since it uses as much as digits as its factorization.

70938209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 70938209 is about 8422.4823537957. The cubic root of 70938209 is about 413.9616155378.

The spelling of 70938209 in words is "seventy million, nine hundred thirty-eight thousand, two hundred nine".