70215917 has 2 divisors, whose sum is σ = 70215918. Its totient is φ = 70215916.

The previous prime is 70215883. The next prime is 70215953. The reversal of 70215917 is 71951207.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49294441 + 20921476 = 7021^2 + 4574^2 .

It is an emirp because it is prime and its reverse (71951207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70215917 - 2¹⁸ = 69953773 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 (70215997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35107958 + 35107959.

It is an arithmetic number, because the mean of its divisors is an integer number (35107959).

Almost surely, 2^70215917 is an apocalyptic number.

It is an amenable number.

70215917 is a deficient number, since it is larger than the sum of its proper divisors (1).

70215917 is an equidigital number, since it uses as much as digits as its factorization.

70215917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 70215917 is about 8379.4938391289. The cubic root of 70215917 is about 412.5518357877.

The spelling of 70215917 in words is "seventy million, two hundred fifteen thousand, nine hundred seventeen".