650149991 has 2 divisors, whose sum is σ = 650149992. Its totient is φ = 650149990.

The previous prime is 650149963. The next prime is 650150003. The reversal of 650149991 is 199941056.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650149991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (650149931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325074995 + 325074996.

It is an arithmetic number, because the mean of its divisors is an integer number (325074996).

Almost surely, 2^650149991 is an apocalyptic number.

650149991 is a deficient number, since it is larger than the sum of its proper divisors (1).

650149991 is an equidigital number, since it uses as much as digits as its factorization.

650149991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 650149991 is about 25498.0389638105. The cubic root of 650149991 is about 866.3057299958.

The spelling of 650149991 in words is "six hundred fifty million, one hundred forty-nine thousand, nine hundred ninety-one".