920561 has 2 divisors, whose sum is σ = 920562. Its totient is φ = 920560.

The previous prime is 920539. The next prime is 920609. The reversal of 920561 is 165029.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776161 + 144400 = 881^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 920561 - 2⁶ = 920497 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 920561.

It is not a weakly prime, because it can be changed into another prime (920761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460280 + 460281.

It is an arithmetic number, because the mean of its divisors is an integer number (460281).

2⁹²⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

920561 is a deficient number, since it is larger than the sum of its proper divisors (1).

920561 is an equidigital number, since it uses as much as digits as its factorization.

920561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 920561 is about 959.4587015604. The cubic root of 920561 is about 97.2786475301.

The spelling of 920561 in words is "nine hundred twenty thousand, five hundred sixty-one".