64002091 has 2 divisors, whose sum is σ = 64002092. Its totient is φ = 64002090.

The previous prime is 64002083. The next prime is 64002121. The reversal of 64002091 is 19020046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64002091 - 2³ = 64002083 is a prime.

It is not a weakly prime, because it can be changed into another prime (64002061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32001045 + 32001046.

It is an arithmetic number, because the mean of its divisors is an integer number (32001046).

Almost surely, 2^64002091 is an apocalyptic number.

64002091 is a deficient number, since it is larger than the sum of its proper divisors (1).

64002091 is an equidigital number, since it uses as much as digits as its factorization.

64002091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 64002091 is about 8000.1306864326. The cubic root of 64002091 is about 400.0043562026.

The spelling of 64002091 in words is "sixty-four million, two thousand, ninety-one".