193217107890857 has 2 divisors, whose sum is σ = 193217107890858. Its totient is φ = 193217107890856.

The previous prime is 193217107890809. The next prime is 193217107890899. The reversal of 193217107890857 is 758098701712391.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130872250083481 + 62344857807376 = 11439941^2 + 7895876^2 .

It is a cyclic number.

It is not a de Polignac number, because 193217107890857 - 2¹⁶ = 193217107825321 is a prime.

It is not a weakly prime, because it can be changed into another prime (193217107890557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96608553945428 + 96608553945429.

It is an arithmetic number, because the mean of its divisors is an integer number (96608553945429).

Almost surely, 2^{193217107890857} is an apocalyptic number.

It is an amenable number.

193217107890857 is a deficient number, since it is larger than the sum of its proper divisors (1).

193217107890857 is an equidigital number, since it uses as much as digits as its factorization.

193217107890857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53343360, while the sum is 68.

The spelling of 193217107890857 in words is "one hundred ninety-three trillion, two hundred seventeen billion, one hundred seven million, eight hundred ninety thousand, eight hundred fifty-seven".