191086061 has 2 divisors, whose sum is σ = 191086062. Its totient is φ = 191086060.

The previous prime is 191086039. The next prime is 191086079. The reversal of 191086061 is 160680191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181413961 + 9672100 = 13469^2 + 3110^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 190980161 and 161089091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191086061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191086081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95543030 + 95543031.

It is an arithmetic number, because the mean of its divisors is an integer number (95543031).

Almost surely, 2^191086061 is an apocalyptic number.

It is an amenable number.

191086061 is a deficient number, since it is larger than the sum of its proper divisors (1).

191086061 is an equidigital number, since it uses as much as digits as its factorization.

191086061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 191086061 is about 13823.3881881397. The cubic root of 191086061 is about 575.9830051007.

The spelling of 191086061 in words is "one hundred ninety-one million, eighty-six thousand, sixty-one".