890221649 has 4 divisors (see below), whose sum is σ = 937075440. Its totient is φ = 843367860.

The previous prime is 890221603. The next prime is 890221663. The reversal of 890221649 is 946122098.

890221649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 890221649 - 2⁸ = 890221393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (890221679) 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, 23426867 + ... + 23426904.

It is an arithmetic number, because the mean of its divisors is an integer number (234268860).

Almost surely, 2^890221649 is an apocalyptic number.

It is an amenable number.

890221649 is a deficient number, since it is larger than the sum of its proper divisors (46853791).

890221649 is a wasteful number, since it uses less digits than its factorization.

890221649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46853790.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 890221649 is about 29836.5823947717. The cubic root of 890221649 is about 961.9800167442.

The spelling of 890221649 in words is "eight hundred ninety million, two hundred twenty-one thousand, six hundred forty-nine".