213070817 has 2 divisors, whose sum is σ = 213070818. Its totient is φ = 213070816.

The previous prime is 213070813. The next prime is 213070841. The reversal of 213070817 is 718070312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147282496 + 65788321 = 12136^2 + 8111^2 .

It is a cyclic number.

It is not a de Polignac number, because 213070817 - 2² = 213070813 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213070817.

It is not a weakly prime, because it can be changed into another prime (213070813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106535408 + 106535409.

It is an arithmetic number, because the mean of its divisors is an integer number (106535409).

Almost surely, 2^213070817 is an apocalyptic number.

It is an amenable number.

213070817 is a deficient number, since it is larger than the sum of its proper divisors (1).

213070817 is an equidigital number, since it uses as much as digits as its factorization.

213070817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 213070817 is about 14596.9454681450. The cubic root of 213070817 is about 597.2754402019.

The spelling of 213070817 in words is "two hundred thirteen million, seventy thousand, eight hundred seventeen".