649491051 has 8 divisors (see below), whose sum is σ = 944714304. Its totient is φ = 393630920.

The previous prime is 649491023. The next prime is 649491067. The reversal of 649491051 is 150194946.

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 649491051 - 2⁶ = 649490987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649491071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9840741 + ... + 9840806.

It is an arithmetic number, because the mean of its divisors is an integer number (118089288).

Almost surely, 2^649491051 is an apocalyptic number.

649491051 is a deficient number, since it is larger than the sum of its proper divisors (295223253).

649491051 is a wasteful number, since it uses less digits than its factorization.

649491051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19681561.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 649491051 is about 25485.1143022746. The cubic root of 649491051 is about 866.0129583441.

The spelling of 649491051 in words is "six hundred forty-nine million, four hundred ninety-one thousand, fifty-one".