91161019 has 2 divisors, whose sum is σ = 91161020. Its totient is φ = 91161018.

The previous prime is 91160969. The next prime is 91161067. The reversal of 91161019 is 91016119.

It is a strong prime.

It is an emirp because it is prime and its reverse (91016119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91161019 - 2¹⁷ = 91029947 is a prime.

It is a super-2 number, since 2×91161019² = 16620662770236722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91161079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45580509 + 45580510.

It is an arithmetic number, because the mean of its divisors is an integer number (45580510).

Almost surely, 2^91161019 is an apocalyptic number.

91161019 is a deficient number, since it is larger than the sum of its proper divisors (1).

91161019 is an equidigital number, since it uses as much as digits as its factorization.

91161019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 28.

The square root of 91161019 is about 9547.8279728952. The cubic root of 91161019 is about 450.0592827248.

The spelling of 91161019 in words is "ninety-one million, one hundred sixty-one thousand, nineteen".