649131 has 8 divisors (see below), whose sum is σ = 989184. Its totient is φ = 370920.

The previous prime is 649123. The next prime is 649141. The reversal of 649131 is 131946.

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

It is not a de Polignac number, because 649131 - 2³ = 649123 is a prime.

It is a super-2 number, since 2×649131² = 842742110322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (649141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15435 + ... + 15476.

It is an arithmetic number, because the mean of its divisors is an integer number (123648).

2⁶⁴⁹¹³¹ is an apocalyptic number.

649131 is a deficient number, since it is larger than the sum of its proper divisors (340053).

649131 is a wasteful number, since it uses less digits than its factorization.

649131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30921.

The product of its digits is 648, while the sum is 24.

The square root of 649131 is about 805.6866636603. The cubic root of 649131 is about 86.5852901498.

It can be divided in two parts, 649 and 131, that added together give a triangular number (780 = T₃₉).

The spelling of 649131 in words is "six hundred forty-nine thousand, one hundred thirty-one".