916621 has 2 divisors, whose sum is σ = 916622. Its totient is φ = 916620.

The previous prime is 916613. The next prime is 916633. The reversal of 916621 is 126619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 835396 + 81225 = 914^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 916621 - 2³ = 916613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (916651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458310 + 458311.

It is an arithmetic number, because the mean of its divisors is an integer number (458311).

2⁹¹⁶⁶²¹ is an apocalyptic number.

It is an amenable number.

916621 is a deficient number, since it is larger than the sum of its proper divisors (1).

916621 is an equidigital number, since it uses as much as digits as its factorization.

916621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 916621 is about 957.4032588204. The cubic root of 916621 is about 97.1396648935.

The spelling of 916621 in words is "nine hundred sixteen thousand, six hundred twenty-one".