191000149 has 2 divisors, whose sum is σ = 191000150. Its totient is φ = 191000148.

The previous prime is 191000143. The next prime is 191000189. The reversal of 191000149 is 941000191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190854225 + 145924 = 13815^2 + 382^2 .

It is an emirp because it is prime and its reverse (941000191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191000149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191000143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95500074 + 95500075.

It is an arithmetic number, because the mean of its divisors is an integer number (95500075).

Almost surely, 2^191000149 is an apocalyptic number.

It is an amenable number.

191000149 is a deficient number, since it is larger than the sum of its proper divisors (1).

191000149 is an equidigital number, since it uses as much as digits as its factorization.

191000149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 191000149 is about 13820.2803517150. The cubic root of 191000149 is about 575.8966718024.

The spelling of 191000149 in words is "one hundred ninety-one million, one hundred forty-nine", and thus it is an aban number.