10321561 has 2 divisors, whose sum is σ = 10321562. Its totient is φ = 10321560.

The previous prime is 10321559. The next prime is 10321583. The reversal of 10321561 is 16512301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9803161 + 518400 = 3131^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 10321561 - 2¹ = 10321559 is a prime.

Together with 10321559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (10328561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160780 + 5160781.

It is an arithmetic number, because the mean of its divisors is an integer number (5160781).

Almost surely, 2^10321561 is an apocalyptic number.

It is an amenable number.

10321561 is a deficient number, since it is larger than the sum of its proper divisors (1).

10321561 is an equidigital number, since it uses as much as digits as its factorization.

10321561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 10321561 is about 3212.7186306927. The cubic root of 10321561 is about 217.7284234283.

Adding to 10321561 its reverse (16512301), we get a palindrome (26833862).

The spelling of 10321561 in words is "ten million, three hundred twenty-one thousand, five hundred sixty-one".