64540999 has 2 divisors, whose sum is σ = 64541000. Its totient is φ = 64540998.

The previous prime is 64540981. The next prime is 64541003. The reversal of 64540999 is 99904546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64540999 - 2⁷ = 64540871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64540199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32270499 + 32270500.

It is an arithmetic number, because the mean of its divisors is an integer number (32270500).

Almost surely, 2^64540999 is an apocalyptic number.

64540999 is a deficient number, since it is larger than the sum of its proper divisors (1).

64540999 is an equidigital number, since it uses as much as digits as its factorization.

64540999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 64540999 is about 8033.7412828644. The cubic root of 64540999 is about 401.1239203001.

The spelling of 64540999 in words is "sixty-four million, five hundred forty thousand, nine hundred ninety-nine".