111821197 has 2 divisors, whose sum is σ = 111821198. Its totient is φ = 111821196.

The previous prime is 111821183. The next prime is 111821201. The reversal of 111821197 is 791128111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111386916 + 434281 = 10554^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 111821197 - 2⁷ = 111821069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111821117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55910598 + 55910599.

It is an arithmetic number, because the mean of its divisors is an integer number (55910599).

Almost surely, 2^111821197 is an apocalyptic number.

It is an amenable number.

111821197 is a deficient number, since it is larger than the sum of its proper divisors (1).

111821197 is an equidigital number, since it uses as much as digits as its factorization.

111821197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 31.

The square root of 111821197 is about 10574.5542222828. The cubic root of 111821197 is about 481.7718039084.

The spelling of 111821197 in words is "one hundred eleven million, eight hundred twenty-one thousand, one hundred ninety-seven".