111213604861 has 2 divisors, whose sum is σ = 111213604862. Its totient is φ = 111213604860.

The previous prime is 111213604727. The next prime is 111213604867. The reversal of 111213604861 is 168406312111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77162283961 + 34051320900 = 277781^2 + 184530^2 .

It is a cyclic number.

It is not a de Polignac number, because 111213604861 - 2²⁹ = 110676733949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111213604867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606802430 + 55606802431.

It is an arithmetic number, because the mean of its divisors is an integer number (55606802431).

Almost surely, 2^111213604861 is an apocalyptic number.

It is an amenable number.

111213604861 is a deficient number, since it is larger than the sum of its proper divisors (1).

111213604861 is an equidigital number, since it uses as much as digits as its factorization.

111213604861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

Adding to 111213604861 its reverse (168406312111), we get a palindrome (279619916972).

The spelling of 111213604861 in words is "one hundred eleven billion, two hundred thirteen million, six hundred four thousand, eight hundred sixty-one".