64530091 has 2 divisors, whose sum is σ = 64530092. Its totient is φ = 64530090.

The previous prime is 64530083. The next prime is 64530149. The reversal of 64530091 is 19003546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64530091 - 2³ = 64530083 is a prime.

It is not a weakly prime, because it can be changed into another prime (64530031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32265045 + 32265046.

It is an arithmetic number, because the mean of its divisors is an integer number (32265046).

Almost surely, 2^64530091 is an apocalyptic number.

64530091 is a deficient number, since it is larger than the sum of its proper divisors (1).

64530091 is an equidigital number, since it uses as much as digits as its factorization.

64530091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 64530091 is about 8033.0623674910. The cubic root of 64530091 is about 401.1013211961.

The spelling of 64530091 in words is "sixty-four million, five hundred thirty thousand, ninety-one".