649057971 has 8 divisors (see below), whose sum is σ = 872017344. Its totient is φ = 429401960.

The previous prime is 649057889. The next prime is 649057973. The reversal of 649057971 is 179750946.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649057971 - 2¹¹ = 649055923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649057971.

It is not an unprimeable number, because it can be changed into a prime (649057973) 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 7 ways as a sum of consecutive naturals, for example, 825381 + ... + 826166.

It is an arithmetic number, because the mean of its divisors is an integer number (109002168).

Almost surely, 2^649057971 is an apocalyptic number.

649057971 is a deficient number, since it is larger than the sum of its proper divisors (222959373).

649057971 is a wasteful number, since it uses less digits than its factorization.

649057971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651681.

The product of its (nonzero) digits is 476280, while the sum is 48.

The square root of 649057971 is about 25476.6161607071. The cubic root of 649057971 is about 865.8204300129.

The spelling of 649057971 in words is "six hundred forty-nine million, fifty-seven thousand, nine hundred seventy-one".