649291 has 2 divisors, whose sum is σ = 649292. Its totient is φ = 649290.

The previous prime is 649283. The next prime is 649307. The reversal of 649291 is 192946.

It is a happy number.

649291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649291 - 2³ = 649283 is a prime.

It is a Chen prime.

649291 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (649261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324645 + 324646.

It is an arithmetic number, because the mean of its divisors is an integer number (324646).

2⁶⁴⁹²⁹¹ is an apocalyptic number.

649291 is a deficient number, since it is larger than the sum of its proper divisors (1).

649291 is an equidigital number, since it uses as much as digits as its factorization.

649291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 649291 is about 805.7859517266. The cubic root of 649291 is about 86.5924035103.

The spelling of 649291 in words is "six hundred forty-nine thousand, two hundred ninety-one".