191085149 has 2 divisors, whose sum is σ = 191085150. Its totient is φ = 191085148.

The previous prime is 191085119. The next prime is 191085179. The reversal of 191085149 is 941580191.

It is a balanced prime because it is at equal distance from previous prime (191085119) and next prime (191085179).

It can be written as a sum of positive squares in only one way, i.e., 149572900 + 41512249 = 12230^2 + 6443^2 .

It is a cyclic number.

It is not a de Polignac number, because 191085149 - 2¹² = 191081053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191085119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95542574 + 95542575.

It is an arithmetic number, because the mean of its divisors is an integer number (95542575).

Almost surely, 2^191085149 is an apocalyptic number.

It is an amenable number.

191085149 is a deficient number, since it is larger than the sum of its proper divisors (1).

191085149 is an equidigital number, since it uses as much as digits as its factorization.

191085149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 191085149 is about 13823.3552005293. The cubic root of 191085149 is about 575.9820887643.

It can be divided in two parts, 19 and 1085149, that multiplied together give a triangular number (20617831 = T₆₄₂₁).

The spelling of 191085149 in words is "one hundred ninety-one million, eighty-five thousand, one hundred forty-nine".