91006073 has 2 divisors, whose sum is σ = 91006074. Its totient is φ = 91006072.

The previous prime is 91006061. The next prime is 91006087. The reversal of 91006073 is 37060019.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77668969 + 13337104 = 8813^2 + 3652^2 .

It is a cyclic number.

It is not a de Polignac number, because 91006073 - 2⁴ = 91006057 is a prime.

It is not a weakly prime, because it can be changed into another prime (91006673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45503036 + 45503037.

It is an arithmetic number, because the mean of its divisors is an integer number (45503037).

Almost surely, 2^91006073 is an apocalyptic number.

It is an amenable number.

91006073 is a deficient number, since it is larger than the sum of its proper divisors (1).

91006073 is an equidigital number, since it uses as much as digits as its factorization.

91006073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 91006073 is about 9539.7103205496. The cubic root of 91006073 is about 449.8041501652.

The spelling of 91006073 in words is "ninety-one million, six thousand, seventy-three".