649950871 has 12 divisors (see below), whose sum is σ = 676725192. Its totient is φ = 624194144.

The previous prime is 649950869. The next prime is 649950877. The reversal of 649950871 is 178059946.

It is not a de Polignac number, because 649950871 - 2¹ = 649950869 is a prime.

It is a super-2 number, since 2×649950871² = 844872269427317282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649950877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163716 + ... + 167638.

It is an arithmetic number, because the mean of its divisors is an integer number (56393766).

Almost surely, 2^649950871 is an apocalyptic number.

649950871 is a deficient number, since it is larger than the sum of its proper divisors (26774321).

649950871 is a wasteful number, since it uses less digits than its factorization.

649950871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4178 (or 4149 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 649950871 is about 25494.1340507969. The cubic root of 649950871 is about 866.2172804521.

The spelling of 649950871 in words is "six hundred forty-nine million, nine hundred fifty thousand, eight hundred seventy-one".