661049 has 2 divisors, whose sum is σ = 661050. Its totient is φ = 661048.

The previous prime is 661027. The next prime is 661061. The reversal of 661049 is 940166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 525625 + 135424 = 725^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 661049 - 2¹⁶ = 595513 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 661049.

It is not a weakly prime, because it can be changed into another prime (661009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330524 + 330525.

It is an arithmetic number, because the mean of its divisors is an integer number (330525).

2⁶⁶¹⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

661049 is a deficient number, since it is larger than the sum of its proper divisors (1).

661049 is an equidigital number, since it uses as much as digits as its factorization.

661049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 661049 is about 813.0491990034. The cubic root of 661049 is about 87.1119798208. Note that the first 3 decimals are identical.

The spelling of 661049 in words is "six hundred sixty-one thousand, forty-nine".