661093 has 2 divisors, whose sum is σ = 661094. Its totient is φ = 661092.

The previous prime is 661091. The next prime is 661097. The reversal of 661093 is 390166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487204 + 173889 = 698^2 + 417^2 .

It is a cyclic number.

It is not a de Polignac number, because 661093 - 2¹ = 661091 is a prime.

Together with 661091, it forms a pair of twin primes.

661093 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330546 + 330547.

It is an arithmetic number, because the mean of its divisors is an integer number (330547).

2⁶⁶¹⁰⁹³ is an apocalyptic number.

It is an amenable number.

661093 is a deficient number, since it is larger than the sum of its proper divisors (1).

661093 is an equidigital number, since it uses as much as digits as its factorization.

661093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 661093 is about 813.0762571862. The cubic root of 661093 is about 87.1139125278.

The spelling of 661093 in words is "six hundred sixty-one thousand, ninety-three".