231109878017 has 2 divisors, whose sum is σ = 231109878018. Its totient is φ = 231109878016.

The previous prime is 231109878007. The next prime is 231109878037. The reversal of 231109878017 is 710878901132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121357476496 + 109752401521 = 348364^2 + 331289^2 .

It is a cyclic number.

It is not a de Polignac number, because 231109878017 - 2¹² = 231109873921 is a prime.

It is not a weakly prime, because it can be changed into another prime (231109878007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115554939008 + 115554939009.

It is an arithmetic number, because the mean of its divisors is an integer number (115554939009).

Almost surely, 2^231109878017 is an apocalyptic number.

It is an amenable number.

231109878017 is a deficient number, since it is larger than the sum of its proper divisors (1).

231109878017 is an equidigital number, since it uses as much as digits as its factorization.

231109878017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 47.

The spelling of 231109878017 in words is "two hundred thirty-one billion, one hundred nine million, eight hundred seventy-eight thousand, seventeen".