649491 has 8 divisors (see below), whose sum is σ = 872400. Its totient is φ = 429792.

The previous prime is 649487. The next prime is 649499. The reversal of 649491 is 194946.

649491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 649491 - 2² = 649487 is a prime.

It is a super-3 number, since 3×649491³ = 821941042728233313, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (649499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (109050).

2⁶⁴⁹⁴⁹¹ is an apocalyptic number.

649491 is a deficient number, since it is larger than the sum of its proper divisors (222909).

649491 is a wasteful number, since it uses less digits than its factorization.

649491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605.

The product of its digits is 7776, while the sum is 33.

The square root of 649491 is about 805.9100446080. The cubic root of 649491 is about 86.6012935677.

The spelling of 649491 in words is "six hundred forty-nine thousand, four hundred ninety-one".