70855217 has 2 divisors, whose sum is σ = 70855218. Its totient is φ = 70855216.

The previous prime is 70855171. The next prime is 70855241. The reversal of 70855217 is 71255807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67502656 + 3352561 = 8216^2 + 1831^2 .

It is a cyclic number.

It is not a de Polignac number, because 70855217 - 2⁸ = 70854961 is a prime.

It is a super-2 number, since 2×70855217² = 10040923552234178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70855297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35427608 + 35427609.

It is an arithmetic number, because the mean of its divisors is an integer number (35427609).

Almost surely, 2^70855217 is an apocalyptic number.

It is an amenable number.

70855217 is a deficient number, since it is larger than the sum of its proper divisors (1).

70855217 is an equidigital number, since it uses as much as digits as its factorization.

70855217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 70855217 is about 8417.5540984303. The cubic root of 70855217 is about 413.8001186082.

The spelling of 70855217 in words is "seventy million, eight hundred fifty-five thousand, two hundred seventeen".