649301971 has 4 divisors (see below), whose sum is σ = 649366200. Its totient is φ = 649237744.

The previous prime is 649301969. The next prime is 649301977. The reversal of 649301971 is 179103946.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 649301971 - 2¹ = 649301969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649301977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13261 + ... + 38398.

It is an arithmetic number, because the mean of its divisors is an integer number (162341550).

Almost surely, 2^649301971 is an apocalyptic number.

649301971 is a deficient number, since it is larger than the sum of its proper divisors (64229).

649301971 is a wasteful number, since it uses less digits than its factorization.

649301971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64228.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 649301971 is about 25481.4044157696. The cubic root of 649301971 is about 865.9289122168.

The spelling of 649301971 in words is "six hundred forty-nine million, three hundred one thousand, nine hundred seventy-one".