217031129351 has 2 divisors, whose sum is σ = 217031129352. Its totient is φ = 217031129350.

The previous prime is 217031129327. The next prime is 217031129423. The reversal of 217031129351 is 153921130712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217031129351 is a prime.

It is a super-2 number, since 2×217031129351² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217031129951) 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, 108515564675 + 108515564676.

It is an arithmetic number, because the mean of its divisors is an integer number (108515564676).

Almost surely, 2^217031129351 is an apocalyptic number.

217031129351 is a deficient number, since it is larger than the sum of its proper divisors (1).

217031129351 is an equidigital number, since it uses as much as digits as its factorization.

217031129351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The spelling of 217031129351 in words is "two hundred seventeen billion, thirty-one million, one hundred twenty-nine thousand, three hundred fifty-one".