190000091 has 2 divisors, whose sum is σ = 190000092. Its totient is φ = 190000090.

The previous prime is 190000067. The next prime is 190000099.

190000091 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190000091 is a prime.

It is a super-2 number, since 2×190000091² = 72200069160016562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190000099) 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, 95000045 + 95000046.

It is an arithmetic number, because the mean of its divisors is an integer number (95000046).

Almost surely, 2^190000091 is an apocalyptic number.

190000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

190000091 is an equidigital number, since it uses as much as digits as its factorization.

190000091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 190000091 is about 13784.0520530068. The cubic root of 190000091 is about 574.8897996751.

It can be divided in two parts, 1900000 and 91, that added together give a palindrome (1900091).

The spelling of 190000091 in words is "one hundred ninety million, ninety-one", and thus it is an aban number.