862649 has 2 divisors, whose sum is σ = 862650. Its totient is φ = 862648.

The previous prime is 862633. The next prime is 862651. The reversal of 862649 is 946268.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 822649 + 40000 = 907^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 862649 - 2⁴ = 862633 is a prime.

Together with 862651, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 8 + 6⁶ + 6⁷ + 2⁹ + 4⁶ + 9⁶ .

It is not a weakly prime, because it can be changed into another prime (862669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431324 + 431325.

It is an arithmetic number, because the mean of its divisors is an integer number (431325).

2⁸⁶²⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

862649 is a deficient number, since it is larger than the sum of its proper divisors (1).

862649 is an equidigital number, since it uses as much as digits as its factorization.

862649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 862649 is about 928.7889964895. The cubic root of 862649 is about 95.1943941924.

The spelling of 862649 in words is "eight hundred sixty-two thousand, six hundred forty-nine".