111331230161 has 2 divisors, whose sum is σ = 111331230162. Its totient is φ = 111331230160.

The previous prime is 111331230139. The next prime is 111331230163. The reversal of 111331230161 is 161032133111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108533349136 + 2797881025 = 329444^2 + 52895^2 .

It is a cyclic number.

It is not a de Polignac number, because 111331230161 - 2²² = 111327035857 is a prime.

Together with 111331230163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111331230163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55665615080 + 55665615081.

It is an arithmetic number, because the mean of its divisors is an integer number (55665615081).

Almost surely, 2^111331230161 is an apocalyptic number.

It is an amenable number.

111331230161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111331230161 is an equidigital number, since it uses as much as digits as its factorization.

111331230161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 111331230161 its reverse (161032133111), we get a palindrome (272363363272).

The spelling of 111331230161 in words is "one hundred eleven billion, three hundred thirty-one million, two hundred thirty thousand, one hundred sixty-one".