191101061 has 2 divisors, whose sum is σ = 191101062. Its totient is φ = 191101060.

The previous prime is 191101051. The next prime is 191101117. The reversal of 191101061 is 160101191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127260961 + 63840100 = 11281^2 + 7990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191101061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191101021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95550530 + 95550531.

It is an arithmetic number, because the mean of its divisors is an integer number (95550531).

Almost surely, 2^191101061 is an apocalyptic number.

It is an amenable number.

191101061 is a deficient number, since it is larger than the sum of its proper divisors (1).

191101061 is an equidigital number, since it uses as much as digits as its factorization.

191101061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 20.

The square root of 191101061 is about 13823.9307362269. The cubic root of 191101061 is about 575.9980760047.

The spelling of 191101061 in words is "one hundred ninety-one million, one hundred one thousand, sixty-one".