91064009 has 2 divisors, whose sum is σ = 91064010. Its totient is φ = 91064008.

The previous prime is 91064003. The next prime is 91064041. The reversal of 91064009 is 90046019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73188025 + 17875984 = 8555^2 + 4228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91064009 is a prime.

It is not a weakly prime, because it can be changed into another prime (91064003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45532004 + 45532005.

It is an arithmetic number, because the mean of its divisors is an integer number (45532005).

Almost surely, 2^91064009 is an apocalyptic number.

It is an amenable number.

91064009 is a deficient number, since it is larger than the sum of its proper divisors (1).

91064009 is an equidigital number, since it uses as much as digits as its factorization.

91064009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 91064009 is about 9542.7464076124. The cubic root of 91064009 is about 449.8995808850.

The spelling of 91064009 in words is "ninety-one million, sixty-four thousand, nine".