906938221 has 4 divisors (see below), whose sum is σ = 1036500832. Its totient is φ = 777375612.

The previous prime is 906938183. The next prime is 906938237. The reversal of 906938221 is 122839609.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122839609 = 67 ⋅1833427.

It is a cyclic number.

It is not a de Polignac number, because 906938221 - 2¹⁵ = 906905453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906938251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64781295 + ... + 64781308.

It is an arithmetic number, because the mean of its divisors is an integer number (259125208).

Almost surely, 2^906938221 is an apocalyptic number.

It is an amenable number.

906938221 is a deficient number, since it is larger than the sum of its proper divisors (129562611).

906938221 is a wasteful number, since it uses less digits than its factorization.

906938221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129562610.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 906938221 is about 30115.4150062721. The cubic root of 906938221 is about 967.9640653993.

The spelling of 906938221 in words is "nine hundred six million, nine hundred thirty-eight thousand, two hundred twenty-one".