64989091 has 2 divisors, whose sum is σ = 64989092. Its totient is φ = 64989090.

The previous prime is 64989073. The next prime is 64989097. The reversal of 64989091 is 19098946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64989091 - 2⁹ = 64988579 is a prime.

It is not a weakly prime, because it can be changed into another prime (64989097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32494545 + 32494546.

It is an arithmetic number, because the mean of its divisors is an integer number (32494546).

Almost surely, 2^64989091 is an apocalyptic number.

64989091 is a deficient number, since it is larger than the sum of its proper divisors (1).

64989091 is an equidigital number, since it uses as much as digits as its factorization.

64989091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 64989091 is about 8061.5811724500. The cubic root of 64989091 is about 402.0500812172.

The spelling of 64989091 in words is "sixty-four million, nine hundred eighty-nine thousand, ninety-one".