822651649 has 4 divisors (see below), whose sum is σ = 858419136. Its totient is φ = 786884164.

The previous prime is 822651647. The next prime is 822651679. The reversal of 822651649 is 946156228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 822651649 - 2¹ = 822651647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (822651647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17883709 + ... + 17883754.

It is an arithmetic number, because the mean of its divisors is an integer number (214604784).

Almost surely, 2^822651649 is an apocalyptic number.

It is an amenable number.

822651649 is a deficient number, since it is larger than the sum of its proper divisors (35767487).

822651649 is a wasteful number, since it uses less digits than its factorization.

822651649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35767486.

The product of its digits is 207360, while the sum is 43.

The square root of 822651649 is about 28681.9045567061. The cubic root of 822651649 is about 936.9979862571.

The spelling of 822651649 in words is "eight hundred twenty-two million, six hundred fifty-one thousand, six hundred forty-nine".