91019 has 2 divisors, whose sum is σ = 91020. Its totient is φ = 91018.

The previous prime is 91009. The next prime is 91033.

91019 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 91019 - 2¹² = 86923 is a prime.

It is a super-2 number, since 2×91019² = 16568916722, which contains 22 as substring.

It is a Chen prime.

It is equal to p₈₈₀₄ and since 91019 and 8804 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (91009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45509 + 45510.

It is an arithmetic number, because the mean of its divisors is an integer number (45510).

2⁹¹⁰¹⁹ is an apocalyptic number.

91019 is a deficient number, since it is larger than the sum of its proper divisors (1).

91019 is an equidigital number, since it uses as much as digits as its factorization.

91019 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 91019 is about 301.6935531297. The cubic root of 91019 is about 44.9825446703.

It can be divided in two parts, 910 and 19, that added together give a palindrome (929).

The spelling of 91019 in words is "ninety-one thousand, nineteen".