916561 has 2 divisors, whose sum is σ = 916562. Its totient is φ = 916560.

The previous prime is 916537. The next prime is 916571. The reversal of 916561 is 165619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 398161 = 720^2 + 631^2 .

It is a cyclic number.

It is not a de Polignac number, because 916561 - 2⁹ = 916049 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (916501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458280 + 458281.

It is an arithmetic number, because the mean of its divisors is an integer number (458281).

2⁹¹⁶⁵⁶¹ is an apocalyptic number.

It is an amenable number.

916561 is a deficient number, since it is larger than the sum of its proper divisors (1).

916561 is an equidigital number, since it uses as much as digits as its factorization.

916561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 28.

The square root of 916561 is about 957.3719235490. The cubic root of 916561 is about 97.1375453307.

The spelling of 916561 in words is "nine hundred sixteen thousand, five hundred sixty-one".