217045252331 has 2 divisors, whose sum is σ = 217045252332. Its totient is φ = 217045252330.

The previous prime is 217045252253. The next prime is 217045252349. The reversal of 217045252331 is 133252540712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217045252331 - 2²² = 217041058027 is a prime.

It is a super-2 number, since 2×217045252331² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 217045252291 and 217045252300.

It is not a weakly prime, because it can be changed into another prime (217045251331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108522626165 + 108522626166.

It is an arithmetic number, because the mean of its divisors is an integer number (108522626166).

Almost surely, 2^217045252331 is an apocalyptic number.

217045252331 is a deficient number, since it is larger than the sum of its proper divisors (1).

217045252331 is an equidigital number, since it uses as much as digits as its factorization.

217045252331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 217045252331 in words is "two hundred seventeen billion, forty-five million, two hundred fifty-two thousand, three hundred thirty-one".