649281 has 16 divisors (see below), whose sum is σ = 950400. Its totient is φ = 392448.

The previous prime is 649279. The next prime is 649283. The reversal of 649281 is 182946.

It is an interprime number because it is at equal distance from previous prime (649279) and next prime (649283).

It is not a de Polignac number, because 649281 - 2¹ = 649279 is a prime.

It is a super-2 number, since 2×649281² = 843131633922, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649281.

It is not an unprimeable number, because it can be changed into a prime (649283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1260 + ... + 1698.

It is an arithmetic number, because the mean of its divisors is an integer number (59400).

2⁶⁴⁹²⁸¹ is an apocalyptic number.

It is an amenable number.

649281 is a deficient number, since it is larger than the sum of its proper divisors (301119).

649281 is a wasteful number, since it uses less digits than its factorization.

649281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488.

The product of its digits is 3456, while the sum is 30.

The square root of 649281 is about 805.7797465809. The cubic root of 649281 is about 86.5919589595.

The spelling of 649281 in words is "six hundred forty-nine thousand, two hundred eighty-one".