231698617 has 2 divisors, whose sum is σ = 231698618. Its totient is φ = 231698616.

The previous prime is 231698587. The next prime is 231698629. The reversal of 231698617 is 716896132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231617961 + 80656 = 15219^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 231698617 - 2¹⁹ = 231174329 is a prime.

It is a super-3 number, since 3×231698617³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (231698017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115849308 + 115849309.

It is an arithmetic number, because the mean of its divisors is an integer number (115849309).

Almost surely, 2^231698617 is an apocalyptic number.

It is an amenable number.

231698617 is a deficient number, since it is larger than the sum of its proper divisors (1).

231698617 is an equidigital number, since it uses as much as digits as its factorization.

231698617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 231698617 is about 15221.6496149399. The cubic root of 231698617 is about 614.1971739575.

The spelling of 231698617 in words is "two hundred thirty-one million, six hundred ninety-eight thousand, six hundred seventeen".