650249999 has 16 divisors (see below), whose sum is σ = 761916672. Its totient is φ = 543328128.

The previous prime is 650249993. The next prime is 650250001. The reversal of 650249999 is 999942056.

It is a Cunningham number, because it is equal to 25500²-1.

It is a de Polignac number, because none of the positive numbers 2^k-650249999 is a prime.

It is a super-2 number, since 2×650249999² = 845650122399000002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 650249999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650249993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176672 + ... + 180314.

It is an arithmetic number, because the mean of its divisors is an integer number (47619792).

Almost surely, 2^650249999 is an apocalyptic number.

650249999 is a deficient number, since it is larger than the sum of its proper divisors (111666673).

650249999 is a wasteful number, since it uses less digits than its factorization.

650249999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 650249999 is about 25499.9999803922. Note that the first 4 decimals coincide. The cubic root of 650249999 is about 866.3501469574.

The spelling of 650249999 in words is "six hundred fifty million, two hundred forty-nine thousand, nine hundred ninety-nine".