91000919 has 2 divisors, whose sum is σ = 91000920. Its totient is φ = 91000918.

The previous prime is 91000867. The next prime is 91000933. The reversal of 91000919 is 91900019.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91000919 - 2¹² = 90996823 is a prime.

It is a super-2 number, since 2×91000919² = 16562334517689122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91000891 and 91000900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91000979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500459 + 45500460.

It is an arithmetic number, because the mean of its divisors is an integer number (45500460).

Almost surely, 2^91000919 is an apocalyptic number.

91000919 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000919 is an equidigital number, since it uses as much as digits as its factorization.

91000919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 91000919 is about 9539.4401827361. The cubic root of 91000919 is about 449.7956586646.

It can be divided in two parts, 91000 and 919, that added together give a palindrome (91919).

The spelling of 91000919 in words is "ninety-one million, nine hundred nineteen", and thus it is an aban number.