916055821 has 2 divisors, whose sum is σ = 916055822. Its totient is φ = 916055820.

The previous prime is 916055813. The next prime is 916055851. The reversal of 916055821 is 128550619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514654596 + 401401225 = 22686^2 + 20035^2 .

It is a cyclic number.

It is not a de Polignac number, because 916055821 - 2³ = 916055813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (916055801) 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 as a sum of consecutive naturals, namely, 458027910 + 458027911.

It is an arithmetic number, because the mean of its divisors is an integer number (458027911).

Almost surely, 2^916055821 is an apocalyptic number.

It is an amenable number.

916055821 is a deficient number, since it is larger than the sum of its proper divisors (1).

916055821 is an equidigital number, since it uses as much as digits as its factorization.

916055821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 916055821 is about 30266.4140756714. The cubic root of 916055821 is about 971.1969568539.

The spelling of 916055821 in words is "nine hundred sixteen million, fifty-five thousand, eight hundred twenty-one".