661459 has 2 divisors, whose sum is σ = 661460. Its totient is φ = 661458.

The previous prime is 661439. The next prime is 661477. The reversal of 661459 is 954166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661459 - 2¹³ = 653267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661459.

It is not a weakly prime, because it can be changed into another prime (661439) 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, 330729 + 330730.

It is an arithmetic number, because the mean of its divisors is an integer number (330730).

2⁶⁶¹⁴⁵⁹ is an apocalyptic number.

661459 is a deficient number, since it is larger than the sum of its proper divisors (1).

661459 is an equidigital number, since it uses as much as digits as its factorization.

661459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 661459 is about 813.3012971833. The cubic root of 661459 is about 87.1299858135.

The spelling of 661459 in words is "six hundred sixty-one thousand, four hundred fifty-nine".