111720901 has 2 divisors, whose sum is σ = 111720902. Its totient is φ = 111720900.

The previous prime is 111720887. The next prime is 111720911. The reversal of 111720901 is 109027111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92352100 + 19368801 = 9610^2 + 4401^2 .

It is a cyclic number.

It is not a de Polignac number, because 111720901 - 2¹¹ = 111718853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111720911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55860450 + 55860451.

It is an arithmetic number, because the mean of its divisors is an integer number (55860451).

Almost surely, 2^111720901 is an apocalyptic number.

It is an amenable number.

111720901 is a deficient number, since it is larger than the sum of its proper divisors (1).

111720901 is an equidigital number, since it uses as much as digits as its factorization.

111720901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 111720901 is about 10569.8108308522. The cubic root of 111720901 is about 481.6277219876.

The spelling of 111720901 in words is "one hundred eleven million, seven hundred twenty thousand, nine hundred one".