217700641 has 2 divisors, whose sum is σ = 217700642. Its totient is φ = 217700640.

The previous prime is 217700603. The next prime is 217700653. The reversal of 217700641 is 146007712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113742225 + 103958416 = 10665^2 + 10196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217700641 is a prime.

It is not a weakly prime, because it can be changed into another prime (217700741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108850320 + 108850321.

It is an arithmetic number, because the mean of its divisors is an integer number (108850321).

Almost surely, 2^217700641 is an apocalyptic number.

It is an amenable number.

217700641 is a deficient number, since it is larger than the sum of its proper divisors (1).

217700641 is an equidigital number, since it uses as much as digits as its factorization.

217700641 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 28.

The square root of 217700641 is about 14754.6820026729. The cubic root of 217700641 is about 601.5705529447.

The spelling of 217700641 in words is "two hundred seventeen million, seven hundred thousand, six hundred forty-one".