111091961 has 2 divisors, whose sum is σ = 111091962. Its totient is φ = 111091960.

The previous prime is 111091927. The next prime is 111091969. The reversal of 111091961 is 169190111.

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., 111091600 + 361 = 10540^2 + 19^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111091961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111091969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55545980 + 55545981.

It is an arithmetic number, because the mean of its divisors is an integer number (55545981).

Almost surely, 2^111091961 is an apocalyptic number.

It is an amenable number.

111091961 is a deficient number, since it is larger than the sum of its proper divisors (1).

111091961 is an equidigital number, since it uses as much as digits as its factorization.

111091961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 29.

The square root of 111091961 is about 10540.0171252233. The cubic root of 111091961 is about 480.7222359427.

The spelling of 111091961 in words is "one hundred eleven million, ninety-one thousand, nine hundred sixty-one".