111990200261 has 2 divisors, whose sum is σ = 111990200262. Its totient is φ = 111990200260.

The previous prime is 111990200227. The next prime is 111990200279. The reversal of 111990200261 is 162002099111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87021460036 + 24968740225 = 294994^2 + 158015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111990200261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111990200221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55995100130 + 55995100131.

It is an arithmetic number, because the mean of its divisors is an integer number (55995100131).

Almost surely, 2^111990200261 is an apocalyptic number.

It is an amenable number.

111990200261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111990200261 is an equidigital number, since it uses as much as digits as its factorization.

111990200261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

Adding to 111990200261 its reverse (162002099111), we get a palindrome (273992299372).

The spelling of 111990200261 in words is "one hundred eleven billion, nine hundred ninety million, two hundred thousand, two hundred sixty-one".